Running a starter with a battery that's low on charge will shorten the life of the starter dramatically, and deep-cycling a regular battery will kill the battery. I'd keep it on a battery charger and leave the battery cable off until you can fix the electrical drain issue.
Once you've got it running and the wiring done, I'd take a measurement of standby current. A car like yours with no gizmos should draw <100mA with the key out and doors closed.
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