Can you recommend modern hardware recreations (no software-only emulators) of the ZX Spectrum that are 100% compatible with the BASIC of the original 48K model and don't cost a fortune?
The devices should be fully assembled but kits or boards with no case are an option. They should also provide connections to modern displays and possibly also external keyboards.
I'm aware of these recreations:
ZX Spectrum Next
https://www.specnext.com
ESP32 Rainbow
https://www.esp32rainbow.com
Recreated Sinclair ZX Spectrum
https://recreatedzxspectrum.com
Asking for a friend, an actual friend.