Hey!
Yes I absolutely agree, that could be a bit jarring for your customers and no doubt causes drop off. Somehow, and I have half an idea why, mine is still displaying in multi currency and allowing that all the way through checkout without reverting to AED at any point.
I think I found your brand on IG, drop me a message on there @nealewkelly and we can compare store settings and hopefully get you on USD!
N