I got an orion thin oag a few months ago, once the two camera's are setup for mutual focus you don't have to do it again.
The pic shows mine with a Baader coma corector fitted (for giuding on my 10" newt), but I can remove that and fit a 2" nosepiece to use it with my RC scope without any adjustments to the oag spacings.
The only spacer that I had to add was a 2mm thin ring to the 120mc guide camera (from the bintel variable spacer adapter kit)
https://www.bintel.com.au/product/bi...-locking-ring/
A bit harder to find guide stars at times but as others have said an oag eliminates so many other issues.