Rlynne,
I have not seen anything that says any of the options is not legal.
All options require you find an "other" party who is willing to accept whatever it is you have to offer.
Number 1, if there is a change of heart in the "debtor" [only God knows the heart of man], this is viable option.
For Number 2, you will need to visit those institutions which accept commercial paper for deposit or exchange. At a bank, you might hear "we don't take those (commercial liens) because they (your commercial paper) involve risk, and our bank is a zero percent risk-taker." A bank vice president told me such (regarding another type of commercial paper), and suggested trying citicorp, general american, or some other places that take risks. Risk is in the "debtor" not "paying", or no potential buyer wanting to buy.
Number 3, is definitely a possibility. There exist companies who do viatical settlements, factoring and other such conversions of streams of payments into lump sums or vice versa. The idea is in the exchange, the "broker" of the deal subtracts his fee from the lump sum. Search the web for "factoring" (of payments), that should lead you to what you want.
Number 4 is straight forward. Your seller must be willing to accept as payment your assignment of partial interest for the goods/services you buy. Check with your state's secretary of state for forms, and where to file and fees for filing.
Number 5 is in the form if what is known as trustee's sales, foreclosure sales, sheriff's sales, or tax sales: such sale is usually an auction (public, or private if requested) and bids may be open or sealed. A trustee (sheriff can be trustee) being entrusted with authority, typically called a "power of sale", can dispose of the property without any "judicial intervention" due to terms of the contract or mortgage or deed of trust or security agreement. A book on procedure of foreclosing mortgages would be a valuable reference. Thomson west
linked here has such books.
Incidentally, purported lenders use all these options. I've had purported creditors offer me substantial (75%) discounts for their paper due to (1)non-payment by the purported debtor and (2) being second in priority; first priority "claimant" was foreclosing.
If a "debtor" "pays", 2, 3, and 4 are viable.
If a "debtor" fails to "pay", eventually a prudent holder of the commercial paper will have to do Number 5 or else the paper will be worthless.