deb http://apt.ffho.net bullseye contrib non-free main deb-src http://apt.ffho.net bullseye contrib non-free main
ffho-bullseye-signing-key.asc
deb http://apt.ffho.net buster contrib non-free main deb-src http://apt.ffho.net buster contrib non-free main
ffho-buster-signing-key.asc
Dig through the pool here