[svzephyr44]

Patience... If you can leave it open. Spend 10 minutes each day to spray it with "Blaster" (better than WD-40) and apply a little heat. If that does not work in a week or two then you can drill out the screws, re-tap the holes, and start over (with anti-seize.) Normally I might agree with leave it alone - but I gather you have no access to the throttle and shift controls nor to the gears for your wheel. You don't want to be in a position to try and break the screws open when you have an engine or steering failure at sea!

Fair winds and following seas