I don't see it as a lack of respect if you want to get laid, and like it with this guy - we women can be just like men when it comes to sex ain't a thing wrong with it.
That you are coming on here and questioning whether it is a good idea and whether it will hurt his recovery etc. is a big red flag to me. Those thoughts are crossing your mind for a reason and I would pay attention to them. His recovery is his - not really yours to be concerned with when it comes to this subject (sex). I wonder though if you are more concerned about getting back involved with him period. What kind of obligations will occur etc.
You had a relationship before - honestly I don't think its often successful to break up then rewrite the terms of the relationship in this way NO STRINGS ATTACHED.
Unless reconciliation is something you would be up for I would skip it. Too many possible complications here.