Hi Dave I have used your set up a couple of times where I can withdraw the whole sail control unit for servicing.
I usually have a locating spigot at the bow of the sail boat where the control unit slots into.
It is worth mentioning that there are standard size servos with drum winches at around £10 which can be used for the lesser tasks.
I have a 32 inch loa yacht which stands about 4' 6" high and one of these winches happily runs main and jib.
These are the ones with the enclosed drum and do not need an out and back line. They are not perfect but as long as you give an adequare space gap from o/p to any guiding items they work fine. If necessary I loop an inch of solder wire loosely onto the out lines to make sure they do not bundle up inside.