You may have considered this already I'm aware that at least one other crowd funded project created 'Tariff PnP Add-ons' which they've sold in addition to the main game as a means of raising revenue. I'm not sure how well it's worked although I know I've certainly bought into it myself despite not being in the affected tariff zone; (a) because it enhances the game at a low price and, (b) it seems like a nice way of supporting creators and small businesses like yourselves without really losing out in the process. I don't know whether or not you could do this yourself and I understand that it would entail more work on your part but it might (being PnP) provide a positive opportunity to raise extra revenue on a low cost 'something for something' basis whilst inviting everyone to contribute rather than just US customers alone.