You can repair bent alloy wheels, but I wouldn’t bother. There’s a bloke up our way who does them, generally Porsche & Ferrari wheels that cost a couple of grand a piece, and Moto-x bits that have cracked.
With a Corolla wheel, you’ll be saving bugger all over the cost of a replacement (probably £70 to £80 for a repair and repaint), and have a repaired wheel, which is never going to be as strong.
I’d just get on ebay / autotrader / japanese car liker forum / scrapyards and buy a second hand wheel. There must be loads of Kevins about rolling on 19s with a set of standard alloys in the garage…