I will not have time to come up with a clamp solution at the moment but plan to do this in about a month. As I have understood it, clamping the cells will prolong the life span, but its, not something that is critical. Correct in your opinion, @halfwave?
Per the manufacturer, clamping will extend cell life from 2000 cycles to 3500 cycles.
I think most importantly, it helps keep the cell terminal to busbar connection tight.