OpenWRT 21.02 supports DSA for select devices OOB (replaces swconf) and ships with a really recent 5.4 Linux kernel for all supported devices. So going for a c

OpenWRT 21.02 supports DSA for select devices OOB (replaces swconf) and ships with a really recent 5.4 Linux kernel for all supported devices. So going for a cheap, 2nd hand router supported by OpenWRT is probably the easiest and cheapest way there.