I can't offer any advice sorry, but I'd be interested to hear if you have any success as I've got the same scope.
I looked at a filter slider like these (as the "outside" mounted slider I have won't allow me to reach focus), but I thought it'd clash with either the spider vane or the inside of the curved focuser mounting plate.
Also, I assume you'd either have to use it without the light shroud, or be putting your hands through the spider vanes to slide it.
Good luck!
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