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Hmmmmm, a couple of pictures would help, they are worth a thousand words you know.
The focuser can be as low as you want or can get. 55mm is about midway, if my memory serves correct. Maybe someone with a Moonlite could measure theirs but I recall them being about 35mm, so you gain about 20mm. (and a nicer focuser as well) My Feather Touch is about 40mm, still a gain.
If the mirror is indeed part of the tube end system, we may be stumped. As a last resort trimming the tube will do what you want, and if anything it will not leave a set of mirror mount holes in the tube. Maybe if you have the mirror cell off the tube, see how much forward adjustment is possible with the collimation screws. Heck, once you have the cell on the workbench, you may be able to adapt something to stand the mirror out about an inch or so, enough to get to where you want.
Really though a couple of things. First establish how much "in-focus" you really need. If it is only 10mm or so, then adjusting out the mirror, and a shorter focuser will more than likely do it.
Bear in mind as well that photography will be easier with a top quality focuser, as will ordinary visual viewing, so the replacement focuser has definite benefits.
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