Which TS OAG9 did you get? I was looking at this product earlier in the year when I was contemplating an upgrade of my GSO newtonian. My understanding from the research I did is that it is possible to use both the OAG9 and a MPCC together - that's the whole point. I'm also pretty sure there are a number of users here on IIS who have done just that.
So (as I understand things), assuming you purchased the
OAG9 with the EOS adaptation, then that should connect as is directly to your camera. On the telescope side, I believe you would need
this adaptor to connect the m48 thread of the MPCC to the M48 thread of the OAG9 whilst maintaining the required spacing.
If you were to swap the OAG9 for the lacerta OAG, then you would use
this adapter instead to connect he m48 thread of the MPCC to the M48 thread of the lacerta OAG whilst maintaining correct spacing.
For connecting your Lodestar, the adapters would be as suggested in the email from TS.