Hello Craig,
If it were mine, I would not even THINK about getting it repaired, but what I would think carefully about is getting the existing four road wheels removed and thoroughly inspected for such defects. Your life and other road users lives depend on that action, so I would not delay that.
From the posted photo, it looks as if there may be another crack site on the same wheel??
There is something in my mind going back to when I had hair, that work had been done to assess the effect of road salt on such wheels, which had been shown up at the time to cause corrosion cracking.
Just throw it away Craig, and thoroughly inspect whatever you buy as a repalcement - and as I said - all other wheels on your car.
Kind regards,
Gareth.