You have several different choices here on what all you can do that I can think of. 1) Before you hook up, talk to the guy tell him what you are wanting and would like to do, see if he would be willing to clean himself to where you can suck on his cock, have fans going, a bit of incense as well, that way come the time for you to do such, it results in a bit of a better opportunity for you to do such.
2) You could try the police trick, that is put something that smells even stronger under your nose, like Vicks or say a bit of cinnamon, something that would be overpowering and would tone down the scene of the person.
3) There may be a way to do that, but you have to be willing to do the work for it. Changing a hate, to a like takes a lot of work, and effort on your part. The first is that you start with your own musk. Next time you take a bath, only use water to clean your own cock and balls. Then after you are done and dry out, get a jock and put it on. You are going to wear that jock and do that for about 3 to 5 days straight. Then here is what you do, watch any porn that turns you on, and Jack off, before you cum sniff the scent, just about the time you cum. It will take time, but in time you will start to associate the scent with pleasure.
I like the scent of the balls, it is a turn on, however if they are too powerful, that can be a bit much, so that would be valid for you.