For the Sinclair ZX81 / Commodore PET / Jupiter ACE Tynemouth software do clones (available via The future was 8 bit) which are accurate. I suspect however that

For the Sinclair ZX81 / Commodore PET / Jupiter ACE Tynemouth software do clones (available via The future was 8 bit) which are accurate. I suspect however that doesn't really hit the "Reboot" you're looking for.