AFAICS softhsm2 is available since last week. bind9 9.10 rc2 appears to be in experimental for >1y. Its not set to RFH or RFA, #781739 doesn't tell, so I wonder what is wrong with upstreams current version?
Since bind support in freeipa is optional, maybe its possible to drop it? Without dhcp/slaac integration bind is of little help in freeipa, anyway (IMHO). Regards Harri