Hi - that's a bit of a change. Sounds like an imaging platform with lots of potential and flexibility though.
Have you thought about how well the mount will handle the larger OTA?
Also if you plan to use one of your DSLRs with Hyperstar will that cause additional central obstruction?
I'm just throwing up some points for you to think about - doesn't mean either of those will necessarily cause an issue. It may be worth starting a new thread on the "Equipment Discussions" sub-forum where a larger number of people with direct experience of that mount and/or OTA will see your plans and hopefully be able to advise of any pitfalls or recommendations.