Is there a straight forward way to store a cumulative attribute across a frame range?

At the moment I'm using a point wrangle in a SOP Solver to create a cumulative sum, but I was curious if there is a better pattern for this use case.

That's the only way I know of. The trail sop allows accumulating all of the geometry over a frame range. With that you would have access to multiple time samples to accumlate values with, but that approach involves extra steps and holding much more data in memory that required with a sop solver.

You can also use chops
Bring in stuff using Geometry CHOP, accumulate values using Area CHOP and then bring back to geo using Channel SOP

Alternatively could be done using For Loop in SOPs, but that may feel more convoluted than solver, even though may have advantages for specific cases