MIPS (Little Endian) and MIPS64 (LE) are still fully supported architectures!
> We have decided that the architectures that will be part of the bullseye release are: amd64, arm64, armel, armhf, i386, mips64el, mipsel, ppc64el and s390x (i.e. the same we had for buster minus mips).
Those are MIPS, but Little-Endian instead of Big-Endian.