Thank You so much Darby.
By the looks of your example video it could work.
Now I just am at a loss on where exactly to place that expression. You mentioned a slider.
As of right now the key frames controlling the transition are set within the Radial Wipe Effect (which is the parent to the other layer with the numeric value I pick whipped). And it’s using this Expression effect(“Radial Wipe”)(1) I attached a screen grab.
Do I add the expression you wrote to this expression or how would I implement it?

random progression to radial wipe
Thanks in advance