I wonder if a little spritz sanitizer would prevent it from smelling? Spritz and a TP wipeoff?

I shake mine off and wipe with TP. It works for the guys ;)

I think the "absorbent lining" would probably be a worse bet for smell than the plastic, which you can just wipe off. The pee doesn't really stick to my funnel... a little in the tube, and where the gasket is. (If you've got an extendable tube, be careful to slide the tube all the way out so the gasket seals it... otherwise, messiness.) Otherwise, it wipes right off. I never noticed pee smell. Particularly on the playa, where my nose was clogged with dust, I think wiping with TP is enough for a short-term fix. I spritzed it with water occasionally during the week, too, and used hand-sanitizer on the parts I would touch before using it every once in a while--just in case it had picked up any ickies in my bag or the portas.

Someone vomited on my pant leg last year, and I couldn't get our camp shower up and running. A many-year veteran Burner woman who lives in Gerlach looked at me fussing about getting everything clean and changed and said, completely seriously,"Eh. Just throw some playa dust on it, rub it in and call it good. That stuff'll kill anything."

You might not be near a water source, but you'll probably have a source of water with you. When you're on a road trip, you might not always carry a spritzer of vinegar, but you can always rinse with your water bottle.