Try to determine if it's the spider or the chainring that "bent". A chainring can be straightened by the judicious application of an adjustable wrench closed down to clamp the out-of-line area. If it's truly the spider that's bent, these can be straightened too but it's more difficult and a replacement crank would be worth considering.
As far as the EBB is concerned, I assume it's threaded with standard English threading so any type of English bb should work.