It looks like that is a regular 1 1/8 steerer tube, so there'd be plenty of forks that'd mount up to the frame at least. Your issue will be that disc-brake ready road-specific, or even CX forks aren't that common yet. Finding one with a decently matching axle-to-crown and rake might be a challenge. I'd measure the ATC, then probably look for a supposedly 26", sus corrected disc brake fork to use as a replacement. Failing that, maybe a hybrid disc brake fork.