This idea may cause people to cringe but the cheapest way is to swap pedal axles and use a small amount of locktite. Not the heavy duty type but the low to medium strength. It works and I did that without any issues for a couple of years now. I truely believe that the reverse pedal threading is just old technology that worked back then but is not needed now.
A cheap way to see if the chain angle change is worth it, is to install shims on the drive side to allow the BB to move to the right. If it works then you can get the correct BB length.