Well congrats on your hearing ad.
First off let me start off by saying it is going to be really tough to get to that level. But I am sure you knew that already. But just in case
Also let me say that I know nothing of the place you are talking about so I can not help you there.
I studied professionally for years. (woodwinds and brass)So it might not apply but being in the business for a while I can tell you how it will go.
First you never mentioned how old you are. And that will have a big impact on who you decide will be your teacher. If your at the very least a teenager, which I figure you are at least that old. You are not going to want to have a teacher that mostly deals with children as you will eventually feel like they are talking down to you. You also don't want a finishing coach as they will beat you up as they are preparing you for the next level and not really interested in your learning "your instruments."
Vocal teachers have a tendency to be very snobby. And most of them will probably perceive your hearing aid as a "handicap" and may treat you as such. As well as any auditions you may go on. People in the business don't have any patiences for anything and act it. But I am also sure it won't be impossible to find someone that truly would like to work with you, especially if you show a gift for it. If your really interested in going forward then it would be worth the time to actually go to the schools and see and talk to them. With a music teacher, chemistry is everything. Your teacher may not be "as good" as someone else. But if your chemistry is good it will truly make you leaps and bonds better. And remember no teacher is forever. Don't be afraid to say I've learned all I can from them.
By walking in somewhere, especially bigger schools. You will get a vibe just by walking in and you'll know if it's not right at least. And don't be afraid to try it out and if you don't like it. Don't be afraid to ask for someone else.
Finding a good teacher is not the easiest thing in the world to do. I had to do it for myself for years and know I am doing it for my 2 kids. Good-Luck and always remember to have fun. I left the business because I wasn't having anymore fun. Most people will not make it rich. The love and fun will be the only things to drive you.
