"is there any harm/risk in leaving the paper clip in there in the meantime?"

Beyond the obvious risk it might come into contact with some metal and blow the fuse, none whatsoever.

To get the overdrive disable function back on the shifter, consider pulling the cover from the white box and touching up the solder joints where the heavy frame of the relay itself passes through the holes in the circuit board. As Don Foster told us years ago, "zero dollars."
--
Art Benstein near Baltimore

A lot of money is tainted. 'Taint yours and 'taint mine.