WTB SMD Gatewood Cape -or- MLD Poncho Tarp -or- Golite Poncho Tarp -or- any shelter that doubles as rain gear.

My wife has to get off the trail due to leg pain that hasn't ceased for the past 400 miles.

I'm in a rough situation, gear wise, because I only have a kit that's geared toward 2P loads. I have a heavy TT SS2 and a 9oz rainshell. I'm looking for a shelter that doubles as rainwear fast, so I can get back on the trail with a lighter kit and keep raising money for charity.

http://www.hikefor.com/The_Wandering_Kadings/PCT/2015

Any shelter that doubles as rain gear would fit the bill. Thanks in advance.