Yu can buy notes and not have a clue from a broker and they will teach you how to do it in their brokerage arrangement, just like a stock broker will teach you about buying stock from him and make suggestions.

If you need help finding one that works with investors, contact your local REIA.The Dodd-Frank Act - and subsequently the Safe Harbor Act - completely changed the landscape around mortgages, lease options, and other arrangements. 

Also I require that the tenants have either paid back their former landlord, or have document payment arrangements (with payment history) to repay the landlord.  

Depending on your and your partners particular circumstances, different arrangements are 'best' (as a side note, I have yet to see the 'perfect' answer, there are always tradeoffs). 

It's not clear what the provision of your lease arrangement is with the church, but I would suggest you pull that out and start reviewing it.  

I will encourage them to make payment arrangements with that past landlord before I will consider them and I have succeeded in getting 2 former landlords paid. 

Another chapter, using a broker, if they make private notes then those investors may want their money and may accept a discount, usually not much, but a discount.Look at your lending arrangement, hope you aren't sharing interests in a note with others.

I suppose you could try and find a private lender who is willing to allow this arrangement, but I am not familiar with it.  

I doubt an established agent would want to spend the time unless it was their listing.Why don't you just post an ad on Craigslist describing exactly what you're looking for, what the arrangement and pay would be and see if you get some calls?

Your attorney can set that up if he's skilled in creative assignment arrangements.