I've looked into it a bit, it needs to have some position sensors added, isn't very efficient. One of the reasons I switched to stick was for redundant starting ability. I imagine a 91 626 transmission and clutch pedal bits and?? are pretty affordable from the boneyard.
You might just go ahead and get your starter rebuilt from a local shop as preventative maintenance, and carry a jumper and figure out how to bypass the key starter switch in case it craps out too.
Another option might be a pully and a bit of rope on the crankshaft? or??? That might be worth an experiment or two.