The non-drive side is the same as French thread (35.0 x 1.0mm); an established bike shop may have a tap they can use to chase the threads. The drive side is also 35.0 x 1.0 thread, but reverse thread (clockwise to loosen). These are considerably rarer taps for bike shops to have, but you may luck out.
FWIW, I have Swiss taps here, but I'm nowhere near Rhode Island.