To use a 600MHz Arm Cortex-M7 to emulate the 6510 sounds completely meaningless, then you might aswell use a Raspberry or a PC with Vice?
If it was a microcontroller it might be a challenge and sort of interesting from a memory and power point of view.
The whole point with these 6502 adapters is that you preserve the use of real circuitry, you could pop a 1975 6502 in there!
For the SID, VIC2, 6510 and 6526 what we have now is all we'll ever get. Scarcity is and has always been the endgame.
Just like peak longevity 65nm SSDs X-25E from 2011 or the 14nm Xeon/Atom that where made in 2019, they will never come back because the underlying infrastucture to build them is gone forever!
Today is peak everything, nothing humans make from now on will have only benefits, it's a compromise now.
