[Hazematman]

In the original post about dropping RISC-V support chimera Linux mentions that this existing hardware is too slow realistically use for build machines. They specifically mention the JH7110 which powers the framework board and the spacemit k1/m1 that powers the DC Roma laptop.

So yeah there is hardware available but expect raspberry pi 3 or lower levels of performance.

[Levitating]

Milk-V Pioneer has been the go to build machine for RISC-V (which was used here) which is much faster than a Raspberry Pi 3 for obvious reasons.

Felix Yan uses the same machine for building Archlinux on RISC-V.