Peter, as you are using a colour camera no need for a filter wheel (unless you really want one); put a M54 filter draw on your train instead. On my ED72 I have the SW rotator. It also fits an SW Evostar 150 and a 2" filter can be screwed into that. Maybe it can fit on your scope as another cheaper solution. An email to SW will let you know if it fits.
https://www.ozscopes.com.au/skywatch...l-adaptor.html
I use a 2" optolong ultimate and get a small halo on Barnard as well.....