Posted status
This double sideband TRX kit looks like fun, and not too expensive: https://www.dk9jc.de/blog/equipment/180-d4d-dsb-transceiver-kit-for-digital-mode-for-only-39-95
A bit like a useful version of the RSGB’s PSK receiver kit perhaps.
(I don’t remember where I found DK9JC’s blog, but it’s worth subscribing.)