Seems like a great use for one of those "battery eliminator" things, with an empty plastic shell in the shape of the battery with a pair of leads that extends out of the case.
Yeah, definitely. I started designing one a while back but haven't done the external mounting system for it yet. This is the prototype (finished one would have longer wires and an enclosure that clips onto the back of the Mac someplace): https://68kmla.org/bb/index.php?attachments/img_20201213_191...
