I have another option you may consider...
about four years ago I met an elderly man who was very ill, and couldn't shoot anymore, and like you had no family to pass his collection onto. After talking to him for awhile he realized I wasn't just some young punk, but honestly interested in collecting. So he cut me some very wonderful deals on some really, really nice firearms. In return I helped him move out of his house and a few other favors that he couldn't perform himself... Yard work, lifting, etc...
When I left I promised to take very good care of his guns and they would have a good home, he looked quite sad, but still smiled.
Sadly he passed away a last year.
I always remember him and how kind he was to pass some of these guns to me when I was so young... My collection wouldn't be nearly as nice if it wasn't for his generosity...
Perhaps that is a way to find your fine guns a new home and make sure they will be remembered. He certainly left an impression on me.