you don't need to wipe anything when flashing a kernel..... and I only wipe(if i remember to) wallet when I do a clean flash of a ROM. But I've clean flashed many of times and not wiped wallet. I just never restore data from titanium for wallet. Oh wait, I've done that too. Haven't bricked the secure element yet. So I guess to be safe, do it when you clean flash a new ROM
edit: I really don't understand the question..... just flash the kernel and drive on?