Fix it
Take the drive belt off by slackening the tensioning arm, check for current at the field connectors, of no current the regulator is inop. If no current put a 12 v current to the field terminal on the alternator is harder to turn when the current is applied than when the current is off the alternator is is working OK.
Check the connections on the back of the alternator , most problems are due to bad connections.
While looking at the wires check the data plate and call Airparts or Adams, they will likely have an alternator or regulator that they will dispatch to you if paid by card.
Finding a French mechanic to fit it sould not be to hard.......... Cash is king in such situations.
PA28181........... What is wrong with a map compass and stopwatch ? No need for this new fangled GPS thing.