I dunno, hypothetically this would be priceless. I'd even eat tapifreakinoca if it prevented poison ivy.
I'll echo a couple of other posts, yes, I'm older than dirt and I've got the poison ivy scars to prove it. Betamethasone works incredibly well but it is not without side effects. It absolutely thins my skin in the area if used for more than a week or so but my skin does recover. I use Go-Joe waterless (without pumice, that's like using sandpaper) to scrub down outside and rise with the hose. Then in the shower I use the Go-Joe that you can use with water and scrub with one of those terry cloth scrubbers. I do this if I even think I've come close to the plant. If I have had a known exposure my clothes go in the washer by themselves and washed twice with extra rinse then a rinse cycle in the empty washer to clean it out. I have not had a breakout when I've used this cleaning method. Yeah, you can tell I get it pretty bad. I still get exposed unknowingly mainly when I mow. Currently I've got about 6 pencil lead sized blisters on my legs and arms but the betamethasone is working well. If you are away from home take the Go-Joe with you and a jug of water. Scrub before you get in your vehicle and again when you get home.
I find I'm as susceptible to Virginia Creeper also called five finger ivy, as I am to poison ivy.