Why not just use a longer dovetail bar. We all have extra dovetail bars. They come on and off in a minute and allows the entire scope to re balance easily. Ive use this on my AT-92 with the barlow in front of the 2" diagonal with large 2" eyepieces, and their is plenty of room to always be in balance just by sliding the dovetail in the saddle.
These are little lightweight scopes and require no effort to adjust the position of the scope.
The longer dovetail gets in the way of the focusing knobs. I've mentioned this several times in this thread. The purpose of the risers is to elevate the focusing knobs above the dovetail.
Also, I'm not mounting the telescope on a GEM. I got rid of all my GEMs. I don't like them. I have various alt-az heads that go on tripods. I like having the focusing knobs positioned horizontally and to have them stay in that position. So no GEM, and no focusing knobs shifted vertically to avoid a long dovetail.