I own a flat latch 36 and a 60-15. Both great carry guns. I also own a 10 -5 and a 10-10. I wouldn’t trade any of them. Go find a 10. Spend the 400 to 600 dollars.
I would keep the 3” j frame, It’s a rare bird these days and you can pick up a model 10 anytime. I’d look for an old police trade in with some wear that you can customize a little.
I think the 3" model 36 is worth at least $100 more than a run of the mill later model 10, and will do everything the model 10 will do in a more compact package, unless the model 10 happens to be the 357 previously mentioned