Philip,
I use an QHY5 and /or the Lodestar on a beamsplitter (similar to the OAG) originally on the C9.25 and now on the C11 at both f10 and f6.3 for spectroscopy.
No problems, no issues....
As long as you remember to set the guide and imaging cameras up during the day and fully understand the relationship between the two field of views (coverage and orientation) you should have few problems.
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