My trick for dealing with "blushing bladder" is a Palovian response on myself. I realized I had certain pee triggers. Long story short, there are certain places and situations that cause me to need to urinate. So I figured why not use a word as a trigger? While at home I began saying the trigger word just as I felt the flow begin. Every time I pee, I say the word. My blushing bladder went away. Some of the music venues i frequent have urinals literally elbow to elbow so it's awkward but there's no trouble when I say the trigger word. The only problem now is people look at me weird when I'm looking at my dick saying "shazam".
I read on reddit one time—years and years ago—that doing simple multiplication can help occupy the part of your brain keeping you from pissing. A sequence like 2x2=4, 4x4=16, 16x16=256...etc.
I've been doing that ever since, and it really helps. Usually by the time I get to doing 16x16 in my head, I'm already peeing.