I'm pretty sure gyms(the qualified ones) will take your money. Whether they train you seriously or not is another question.
You are also eligible for the retirement visa, by the way. Have a looksee at the link below. Then you're not tied to any one gym for your visa and can move on from one if it isn't working out for you.
Your adventure is terrific and he's just an imbecile who can't even understand the Shakespeare quote he misused. Pedal on! You're inspiring many of us!