There definitely is a market for this. There are people who will spend
$30 000+ for an APO imaging setup (OTA, mount, camera, etc.) and twice
that for an RC. There are two pieces of advice I can offer:
First, keep the final cost of the system under $10 000.
Second, you should try to make it work with F8 systems because most off
the shelf Ritcheys are in this range. If it only woks with F10 or
longer then you will exclude most of your prime market.

Please state what APO and OTA stand for.
RC I suppose means Ritchey Chretien?