Why?
You could just run FUSE on a suitably-cased Raspberry Pi. With a USB audio capture dongle, or one of those USB Walkman deeleys of the sort advertised in catalogues that fall out of cheap TV listings papers, you can even load your old Spectrum tapes into it.
But of course there is never just one right answer. And I do think this is cool, just because I grew up with 8-bit micros.