Seeking advice from artists or others re fixing favorite teeshirt

So:

I have a bunch of old tee shirts I bought in my hometown of Venice, California, over the years. Some are like tattered jeans, have a patina that is a kind of delight in itself. Most of them are too big for me now as I've lost weight, but that doesn't matter to my sense of sentiment. The last one I bought before moving was a mix of black and turquoise in the background, the letters Venice Beach in black with turquoise edging, California smaller underneath, in all turquoise. In between, a black and turquoise dolphin at play.

After I moved to northern california, this last one was the one I was least sentimental about, and I wore it while painting the new bathroom what turned out to be a bilious medium dark sort of greyed pink. A blotch of this, only one blotch, landed on the tee shirt right around mid boob height. I quickly repainted the bathroom a better color, wearing some other old clothes. For years I've never thrown the tee out, but I also don't wear it as a piece of finery.
I've gotten more sentimental, eh.

I'm wondering if I can fix it. This from someone who used to have twelve pairs of jeans, eleven with paint splatters, for wearing while painting paintings.
The bathroom paint was latex. It doesn't just scrape or wash off of the tee.
Today (laundry day) I was thinking I could put some black and turquoise oil paint over the blotch.
Or, some india black ink and the odd turquoise dot or two.

I know, I know, this sounds "possessed", but it amuses me.

Any ideas? I mean besides getting over it and wearing the thing to the grocery store, or turning it to dust cloths. (The spot is in the wrong place to put a charming pin of some sort).