Is a short-term hold back for a micro transaction a viable ask?

I recently came across a business for sell in the space I'm most interested in, selling for less than $75k, which is a lot smaller than I'm ultimately searching for; however, as a solo self-funded searcher, it provides enough income that I can continue searching without depleting savings, at just part time hours. The downside is the seller only has 4 clients and no contracts with them. They're long term clients, but still... My thought is that I pay upfront for the value of the physical assets and place the reminder of the asking price in escrow with a short-term hold back agreement. Preferably, portions of the hold-back would be released every month until it is all released. My question is how practical is this for such a small deal? Am I being too cautious? Is it too complicated for a small business man to accept?