Be careful what you wish for, you just might get it. I am 57 years old and I used to be very much the grower. As I got older, I guess the elastic tissues in my tunica and the smooth muscle in my corpora just gave out, along with the rest of me. As a result, I have become much more of a shower. But I also went from wearing tight briefs to either loose boxers or boxer/briefs, or more frequently, nothing at all.
I don’t go commando to put on a display. The environment I live in is very humid and wearing underwear is uncomfortable and predisposes to jock itch, so I go without unless decorum demands otherwise. I don’t know how much influence giving up briefs had on my transition from grower to shower, but my gut feeling is it had some.
I’m not huge (7 1/2” BPEL) but moderately thick whether flaccid or erect and my exit point relative to my waistline is such that in almost all pants (except very loose “clown pants) my cock winds up going down one side of my pants leg or the other. On average, I would say I am roughly the volume of a toilet paper cardboard tube flaccid (sometimes smaller, but often bigger) so I often “show” even when I am not aware of it or intending to.
I never understood women who obviously wore tight tops, push up bras and low neck lines and then acted annoyed when guys looked at their tits, but now I sort of do. The truth is, a lot of women, most women, look. Women of all ages look. And a fair number of guys look too, so you should be prepared for that. At times, catching a woman looking can be charming, especially if they then smile (not giggle or break out laughing hysterically, mind), but at other times it can be kind of embarrassing and make me feel like the dirty old man that I am.
As you have noted, the first thing I noticed after starting PE was an increase in flaccid size and this has pretty much been consistent. If you want to show off a little I would suggest that you really work on the Kegels and continue to do Kegels as you are walking around during the day. I suspect that you find yourself plumped up after working out. You can maintain that by wrapping after you workout which tends to hold you in an elongated state. As long as the wrap or tape is thin, you won’t look abnormally thick.
If that doesn’t work find some friend who has a garden. Gardeners always have a ton of excess zucchini they are trying to get rid of.