Hi. There exist various humbucker designs that fit into a single-coil slot. BUT! You already have a HB in the best position on your guitar. Single-coils are slightly noisier, they have that 60-hertz hum and that only when you're not touching the strings, otherwise they should not present a real problem. Your effects maybe amplifying that noise too much.
I have
a Yamaha Pacifica "fat strat" type guitar. I installed a Seymour Duncan Custom Custom HB in bridge and then wanted to upgrade the single-coils (just to experiment). I installed a DiMarzzio Virtual Vintage Solo in the neck position. This is not a true single coil - it has a "dummy" coil on the bottom that cancels hum, but isn't electrically wired or something like that, so it sounds "cleaner" than a regular HB, but it ain't a true single-coil either. I find it nice, but nothing special

Well, I still have the stock single-coil in the middle and it's not worse - Yamaha stock pups are decent (compared to some others).
If I were you I would first try to understand why exactly you get that noise. Then I'd consider a replacement single-coil if I'm still unhappy. If I had my choice now, I'd like to try a Seymour Duncan single-coil, I know I like their HB and bass pups.
P.S. I was very shy about modding my instruments at first, especially messing with the electronics, but one thing after another I learned to do it all (well, yeah, almost). 1 - it's fun, interesting and educating, 2 - it saves money!