Single males are great snuggle buddies, they love their people like tiny dogs. I have been thinking of using my 20 gallon to house 5 female mice but now I am starting to want a 10 gallon for one boy. My first foster mouse was male, Stuart and he was such a sweetheart, he even groomed my hair. I wish I could have adopted him but by then I had a community of 4 girls xD
A single male mouse is the only way it should be done as like betta's two males will fight to the death. I have seen some scary things, males will rip the flesh off each other. In fact single males are the most fun because they bound with you. An hour a day is all you need with a male mouse but if you can spare more time the merrier. The first days taming them is best spent in the bathtub. Taking your boy into the bathroom with you and setting him in the bathtube and letting him come to you and smell you is great. You can even hand him treats to reward and build his comfort around you. If he gets nippy though feed treats with a spoon so he does not associate food with fingers. Also because males are territorial and spray when you clean the cage don't was his house and keep a handful of dirty shavings to sprinkle over clean ones. This will make him more comfortable and he won't go on a spraying rampage after you clean the cage.