The fees on moving a half a bitcoin with Exodus would be a few dollars I think.
then stop using "Exodus" as your bitcoin wallet! i have never heard or used it so i am not sure what you mean by a few dollars but for months bitcoin fees have been very cheap. i have never paid anything more than 10 satoshi per byte which is less than 15 cents. i use Electrum by the way.
Would having 1/2 a coin be worth moving my funds to a supporting wallet?
there is no "supporting wallet" yet except their fork of bitcoin core which is a full node and it is not yet complete. it needs more work before you want to move anything.
and by the way any wallet that you control the private keys will work when you want to claim your BTG tokens.
to be worth it you have to speculate about its price and that is impossible in my opinion. it can be $50 or it can be $1000!