A number of years ago i made a small (tiny) base and collar to use with a dremel handpiece and steel shop made patterns to make the cope
for stair nosings & treads into previously installed millwork panels. The stairs are concrete under the wood casing; the rough crew faces the surfaces with 3/4" plywood, and the feature wood goes right on that, so not a lot of room to work. Between the rough rough crew and the finish work, each does some shimming to yield code compliant step geometry. There were quite a few of these treads on both sides of the theatre at several levels, so worth making the tooling.
(Guy in pic is welder, not our crew.)
Thinking about that, I've decided that when the time comes for the project for which the offset spindle router was considered, I will just improve the Dremel handpiece base and use that. It will probably even get an extra 1/8 or 1/4" closer yet to an obstruction.
A small stubby 5/16" router bit (shop shortened, shop reduced shank will be used, or maybe a very small wing cutter on a 1/8" shank arbor with pilot bearing.
It will be used to cut a rabbet into the edge of some old work where the veneers have been chewed up, to inlay solid feature wood strips. Unfortunately for the straight forward use of a common router, there are occasional obstructions and abutments at each of 16 corners.
No response yet from Betterly.
Thanks for the brainstorming, sorry for my impatience.
smt