Jack,
Over the next year I will be bringing another scope into action. I already have another camera with integral FW; this has a much shorter back-focus requirement than the SX equivalent. Also purchased was a very slimline OAG pickup which takes up only 9mm of back-focus.
With judicious mix and match it should be possible to get decent guiding on both scopes and the use of the SX AO unit on one of them.
If I could figure out how to drive an SBIG OA through either MaximDL or EKOS without needing a SBIG camera it may be possible to get both systems fully equipped. OTOH, if anyone would like to purchase it … 😉
Last year I investigated changing the Dilworth’s transfer lenses to give a longer back focus but that would have been expensive, included a return trip for a delicate piece of kit to Switzerland, and would have spoiled the resolution slightly though that would have been minor as it is seeing limited in practice.
The other scope is an elderly and not very good Meade LX75 25cm Schmidt-Newtonian which will live in a ROR observatory presently under construction. That one will be fully robotic when commissioned.
Paul