Very sorry to hear about all the kerfuffle. Training school sound very unhelpful.
Carrying on the discussion of helmet modifications etc, could you not just get one of them p!ss pot lid / army style helmet things to use for your training? The ones that don't cover your ears? I admit they may not offer the best accident protection but it would get the job done. (to be honest I don't even know if they're legal here, just thinking out loud)
I saw loads of people in Japan wearing them. I don't want any 'you can't wear one of those, they don't offer adequate protection' type posts - I'm just trying to offer an alternative; and certainly one that I'd consider if it worked and got the job done. Obviously you can wear a 'proper' lid without your hearing aids after you've passed
