The culprit is that e2k has exactly one kernel flavour
available at the moment, elbrus-def (there used to be
per-CPU flavours in p8 times -- elbrus-{4c,8c,1cp} --
but these aren't needed anymore), but there are no
std-def/un-def kernels or provides available.
There's more to it, but lacking a kernel is critical.

Maybe other arches might do similar things when needed,
or maybe this gets reverted in favour of a more generic
approach; but patching all starterkits or messing with
p9.mk per-arch (while leaving out regular builds or
any other image that might just build) looks worse.