One of the secrets to Do It Yourself is to know when you should not DIY. This seems to be a time not to DIY. If you close with a title company with title insurance the "due on sale" clause is neutralized and their attorney will draw up the Deed of Trust and Real Estate Lien Note. Yes it is more expensive but worth the risk reduction. Stewart Title on Hulen in Fort Worth used to work with Sub2 and wraps last I knew. Tim is correct that Dodd Frank is complicated and we should rely on specialized pros to handle the docs.
Best regards,
Dan