Tales and Chronicles
Jewel of the North, formerly know as vincegetorix
The problem with that approach is that all full casters in 5e have the same progression, because that's what makes multi-classing spellcasters work (except warlocks, who are weird). It would fit better with the system to give them more sorcery points, which they could then turn into spell slots or use for other shenanigans.
I get that, and I do prefer the houserule where you mix spell points and sorcery points in one large pool. But like you said, warlocks already work differently when multiclassing, so why not the sorcerer? Furthermore, I dont think that having a class following the same chassis as any other spellcaster just because it makes it easier to use with an optional rules is weird; sorcerers should be about breaking the conventional spellcasting! Thats partially why I also think the Mystic we saw in UA makes for a better sorcerer than the sorcerer itself.