Well, if you feel that way, don't send AR11 atall. You must pick a side. Either you send it, and send it the RIGHT way(supposedly), i.e. separatly for everyone and with proof of mailing; or do not send it at all.
Maybe all of the ppl advicing you about hazards of not sending AR11 are wrong, but what if they are right ? As always, err on the side of safety.... couple of bucks is nothing compared to the peace of knowing you did the safe thing.
Bottomline is there is doubt/risk in not sending or sending all in one envelope, however small or miniscule it may be. But there is NO DOUBT and NO RISK in sending separatly with proof of mailing. So make your choice