Oh I don't see this as creepy.
I get where you are coming from, as a gay man I have often wondered how to broach the subject with a guy who my gaydar screams 'He's gay' but there is no solid evidence.
I think the one big mistake is that you did this all in the span of a day. I personally would have given the first letter a couple three days to be answered...
Given that his sexuality is an unknown, and clearly if he is gay he is not out of the closet, having a few days to think about it before responding would have been nice.
Then you set this time limit for a response, really a bad move. You pressured him, assuming he is a closeted fellow that pressure may have had the opposite effect than what you intended.
In future, never suggest that a guy may be gay, or that he 'reads' or 'comes off' as being potentially gay. Too few people, even gay people, want to come of as being 'gay'. That is an immediate shut down.
Do express why you find them attractive, their nice personality, their charming wit, how well they hold the chainsaw when standing over you threatening to cut off your head.. you know the positives
It's OK to express a hope that they can return your affections but that is not the same as saying "I hope you are gay."... Honestly that sentence will drive many closeted guys further into the closet than saying "I hope you can return my affection." - Why? Because 'gay' is a loaded word.