its not easy or straightforward, but it is possible to automate the process of creating a custom brick based on a save. there have been .bls to .obj converters and it probably would be trivial to tack on an .obj to .blb.
But if you want to apply wrench events on a group of bricks, the new duplicator by zeblote already does that. The old duplicator, which has savedup, does not conflict with the new dup, so you can have both enabled on the server at once, and use /olddup to /savedup whenever you need it.