I have 3D-printed myself an adapter to mount a 50 mm Orion guide-scope onto a standard camera adapter bracket:
http://www.thingiverse.com/thing:1068737
It could easily be modified to have a dovetail base rather than a screw-mount base, and could be resized to suit a much smaller accessory such as a laser pointer.
My design uses a two-piece "split-ring" concept to grip the barrel of the accessory, rather than the more conventional thumb-screws in a one-piece adapter. The advantage of this approach is that it is very tolerant of manufacturing dimensions, and can easily fit onto a scope barrel where both the objective end and focuser end are larger diameter than the main barrel where you want to mount it, so would not easily fit through a one-piece bracket. A disadvantage is that it is not so easy to fine-tune the alignment as the usual arrangement of two sets of three thumbscrews, but I deal with this using thin paper, cardboard or plastic shims between the accessory body and the split mount ring (if necessary).
Just another thought for a design concept ... feel free to use this if it would work for you.