@_h_ I understand you're worried about your dog and about the money you've spent. I get that. I really do.
But, grooming is going to be a regular ongoing expense. And will get more expensive as he ages and gets bigger. Or gets mats. Or becomes difficult.
And emergency vet bills are spendy, I get it. But even regular preventative wellness in LA is going to cost you hundreds of dollars annually.
So if you're concerned about those costs, you should reconsider if this is the right breed for you. I know that's hard to hear. But real talk, you come across as somewhat unprepared for all that having this animal involves.
At the very least while he is healthy, be proactive instead of reactive and apply for care credit in case of future vet emergencies, so you don't end up in a position of having to decline care due to costs.
And as a final thought, monitor his wound care and stay in contact with his regular vet. If, at any point, things are not healing well or aren't progressing the way you'd like, dont hesitate to call them immediately. The site of his wound can be... difficult to manage. Rest and no licking are paramount.
I hope you find a groomer that will be able to work with him. Perhaps advise them he has reactive skin on his prepuce and to not clip it too tight as a preventative measure.
Good luck on your journey.