As someone doing **** diet, my plan is to spend a day either at a park or campsite and cook a weeks worth of bacon/messy foods if I'm going to be in a spot where van cooking is the only option during weekdays.
At the house I line a cookie sheet with tinfoil, bacon on that, oven at 375F, 10 minutes, flip, 10 minues, done. I also dump the grease into my cast iron stuff to season them too.
But if forced to do it in the van, the splatter screens do look like the best option, and you could also cover your cooking surface with stainless steel (and maybe some sides too) for easier cleanup if it does get messy.