Is there a way to short such a business model? Don’t get me wrong: I wish you every success in this world, I want neither yourself, nor your business partners to go bust. Still, I think lending to lenders is a high risk business and susceptible to even the tiniest liquidity shortages in the money markets. We did not see any liquidity problems for more than 10 years, so shorting this would be a good hedge.
Good luck, though!