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Thanks for the input everyone.
My main goal is to be able to automate this, and to avoid the mirror flop, which means I need to lock the mirror, which means a main mirror focus adjustment isn't really a solution.
I currently run the EAF on a bintel dual speed focuser. It was a bit tricky to mount it (none of the holes lined up in the provided bracket well), but I've got it working.
Although, just getting a SCT mount crayford and moving the EAF over is probably the most cost effective - the 80ED I found did not really change focus during a night's imaging, although I set it to do a focus run every hour just in case.
I think that's probably my best bet.
Anyone got an SCT Crayford for sale?
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