I have an idea for a house rule that I'm planning on using in my next campaign that I wanted to run by you. It combines the Spell Point and the Slow Natural Healing Variant Rules from the DMG and an idea that I had. Like the Spell Points Variant Rule, instead of keeping track of spell slots, spell-casters have a certain amount of spell points that they can spend to cast spells with different levels of spells costing different amounts of points. However instead of gaining a flat amount every certain level up (depending on the class), spellcasters gain a number equal to a Spell Dice + their Casting Modifier. For every class the dice is a d4 except for the Sorcerer, who gets a d6 (I'll explain later.) Full-Casters get a Spell Dice every level, half-casters get one at level 2 and every odd level thereafter, and bonus-class casters get one at 3rd level, 4th level, and every third level thereafter. The first time that a character would gain a Spell Dice, instead of rolling they gain an amount of Spell Points equal to the maximum amount that could be rolled on the Spell Dice plus their spellcasting modifier.
The second part of the rule is where the Slow Natural Healing Variant Rule comes into play. Not only will I be using this base rule, but also using it with my Spell Points. Instead of regaining all of their lost Spell Points on a long rest, you can spend a number of your Magic Dice, roll them add your Spellcasting modifier (multiplied by the number of dice you spent), and you regain that many Spell points. You regain half-your maximum Spell Dice up to your maximum at the beginning of your Long Rest. Everyone has a number of Spell Dice qual to the amount of times they've gained Spell Points.
The reason I gave Sorcerers a higher Spell Dice is because (a) I want Sorcerers to be more useful than they currently are, and (b) I'm conflating Sorcery Points with Spell Points. To conflate Sorcery Points with Spell Points, Metamagic abilities cost an amount of Spell Points double of how many Sorcery Points they would cost.
What do you guys think? I'm all for constructive criticism.

I've always really dug the whole idea of spell points. It makes more sense to me that magic would run on a generalized pool of energy instead of discrete, denominated charges. But I don't think I've ever actually tried a spell point system, not in any edition.
So, I'm wondering about the spell point variant in the 5e DMG. And, right off the bat, there are a few things that bug me about it.
Spell point costs. That's just a really weird, inelegant points-to-level conversion schedule, there. After mathing on it a bit, I guess the idea is that each level costs 1⅓ points more than the previous one, but it looks entirely nuts when simplified to integers. I really prefer the cost schedule in the D&D 3e variant: it starts at 1 point for a first level spell, and each subsequent level costs 2 more points. (Which is the same formula used for psionic power costs in 3e.)
Anyway, I couldn't begin to guess how many magic missiles one wish spell is worth, so I don't know how I'd actually evaluate these costs. But I get the feeling that 5e went with a slower cost increase in some attempt to mitigate the extent to which low-level spells become trivially cheap for casters using spell points. So there might be good reason for this seeming inelegance.
Skyrocketing spell point pools. The spell-points-by-caster-level progression looks insane, but it's clear that it was determined by looking at what a regular slot-caster could put out at a given level, and what it would take for a point-caster to do the same thing.
But you know what? I'm not buying that rationale. I have a feeling that a lot of high-level wizards go to bed at night with a lot of low-level slots left unused. So that might be way more than your average point-caster actually needs to keep up. And of course if you're not using all those 'extra' points on low-level spells, you can use them to cast more high-level spells than your equal-level slot-caster rivals can.
The 6th-level-and-higher rule. So this one weirdness—limiting point-casters to a maximum of one 6th, 7th, 8th, and 9th-level slot per day—seems like a kluge to address my previous complaint. And I kinda really don't like it. In the middle of this system to avoid the gamey of quantification spell slots, we're got this rule where all of a sudden you can't do 6th-level slots anymore today, because you already did one. But hey, you can still do 7th-level slots. And you can just cast your 6th-level spell with a 7th-level slot. It is just very awkward, is all I'm saying.
So what do you folks think about all this? Has anybody ever actually used this variant? Or, for that matter, the old 3e one? How did the balance shake out? And, of course, the dreaded bookkeeping?