Make a new c64 with a RPI, goto https://accentual.com/bmc64/ and download the bmc software
have the following hardware:
64 case
64 keyboard
rpi3B+
ribbon cable conector for rpi3B+
BMC64 connector (ebay https://www.ebay.co.uk/itm/114935357549?_trksid=p4375194.c101952.m162921https://www.ebay.co.uk/itm/114935357549?_trksid=p4375194.c101952.m162921)