Everlasting pea is Lathyrus latifolius. I have some seeds saved from last year, and I have a bunch of pods forming right now – the first will probably be ready to start harvesting seeds from within a few weeks. If you want some, PM me – I’ll be happy to set some aside for you!
I’d also be happy to trade other things, if you want to chat about what we each have spare stuff of and would like to offer to each other.
Oh! Another thought for you! Have you tried growing common mallow on purpose? It’s a wonderful weed: every part of it is edible and tasty. Not only that, it’s a spectacular medicinal: soak a bit of it in water for a few hours (or days, or weeks, whatever), and then use that as excellent lotion, conditioner, and valuable ointment for speeding up healing of basically any skin problems I’ve tried so far – sunburns, bruises, wasp stings, scratches, rashes, etc. I’m pretty sure I will never need to buy conditioner, lotion, or aloe vera gel ever again, because mallow water works just as well, and it’s super easy to grow, and it’s a very pleasant volunteer to have everywhere in my garden. 
Other mallows will probably work just as well for the same purpose – I’ve used hollyhock water the same way, and it’s just as great. (Hollyhocks are just as edible and just as drought tolerant and just as happy to volunteer for me, by the way.)
Hollyhock and common mallow seeds taste a bit like psyllium husk to me, so I’m thinking about grinding some extra ones up and making a “flour” from them and see if it behaves the same way as psyllium husk. I think it may, because it’s high in mucilage, too. If it does, then I may never need to buy psyllium husk to make my fiber bread again, either. 