Hopefully your notes are not your only investment. If they are not, then an option could be to allocate the entire portfolio to an individual, and then other assets to other heirs. Example: Your house valued at $200,000, equities/MF IRA#1 $300,000, Prosper IRA#2 $100,000, property $70,000, cash $30,000. Number of heirs = 4. Total value = $700,000.
Sale of house and property gives you $300,000 in cash, IRA#1 $300,000, IRA#2 $100,000
Heir #1 receives $75,000 portion of IRA#1 + IRA#2 = $175,000
Heirs #2-4 receive $75,000 portion of IRA#1 + $100,000 cash = $175,000 each
Heir #1 can then manage the notes account from then on.