I was thinking about using the delta mircroscope for this. But I am not sure if the current design is practical in terms of mounting. I would need a base/lower housing so that the flexure mechanism has clearance. But in the current design, is the main body even attached by screws to the lower housing, or does it just “sit” there?
If rigid mounting with screws is possible, I would design another, lower element where two standard powerbanks can be mounted and which has a flat, rectengular base. Then I would try to bond this base with glue to some layers of foam and glue that one to the wooden baseplate. Hope that won’t be too dodgy. Some additional safety could be done by tying it in with loose strings. Not great, but should keep some vibrations away from the stage.
For additional dampening, the case itself has 4 hollow “legs” which could accept 2 cm of EVA foam. That would only work on flat surfaces tho.