You don’t HAVE to decide right now, give it some time. Henry has earned some summer just being horse time, he’s mastered a ton since you got him. Couple months off is not going to erase his brain plus summer weather keeps the sillies at bay. Henry seems sensible enough not to go feral on you. Wouldn’t hurt to be ultra conservative bringing him back to full work either, never a bad choice. IMO.
If you are more comfortable keeping him in some work, the suggestion to find a qualified Junior to come out couple of times a week sounds like a winner.
You like him and from a business aspect, he is an asset to your operation.
Take care of yourself and reassess in, maybe, 60 days when you should at least be feeling a bit better and can see how Henry is adapting to less work.
I recall a poster who evented and had a loose dog create a bad wreck ( she had video IIRC), screwed up her leg. Down for months. Was it Yellow Britches? We kept her entertained during her convalescence, some great threads.
We are here to help you through, keep us updated.