Instead of using the full-length of the bridge tool that is normally used, can you used instead say a 12-inch-long bridge tool and a regular cue extension? This way your aiming stance does not change, and the bridge length is still the same vs a long bridge when using only a cue extension. Basically, it makes you taller by say 6-8 inches which gives you an extended reach.
When I say Bridge tool, I mean this
View attachment 930855
[Usual disclaimer: I am not a certified instructor]
Is this a rules question? It actually would seem to be two questions--one as to whether an extension is legal to use, and the other whether a short(er) bridge/rake/crutch/rest can be used.
As far as I know, extensions are legal, although I did see something that mentioned they need to be "seamless" when attached--which I assume means none of the large, slip-on types. So, the needed answer would be whether a short bridge can be used at all.
I have never found anything specific about physical bridge designs, and actually asked about it on AZB a year or two/three back. I was considering making a shorter bridge that was not simply a straight stick, but ultimately did not find the answer I was seeking.