well, it seems like you wouldn't be able to do standup without serious flexing of your back and thus stretching the skin, but i didnt do any striking training in that whole period so i can't really say.
last ditch, ask the tattoo artist. i got lucky with my last piercings- my piercer happened to have some bjj background and told me to give the cartilage at least 3 months to heal... boy was he right.
His helmet was stifling, it narrowed his vision. And he must see far. His shield was heavy. It threw him off balance. And his target is far away.