I had similar recons in 2007. Mine went wrong from the start-litarally before I was discharged--, but that's another story.
Within a year in was back chopping wood and wrestling yearling horses. Nothing seems to do more damage . I do get sore sometimes and struggle with lifting heavy things over my head. No one told me planks were out...not my strongest move but I do them. Side planks make me feel like my implants are going to shoot into my armpits (again) so I avoid those.
Do what you want to. If you want to do boxing, do boxing. Wear a padded vest so no one smacks you in the foob (that hurts) if you want to spar. If you just want to beat up a bag, get into it! You all know if you go too far, just take it easy to start with. Mxx