I don't have any ideas, but I have empathy! I have OAS, and although right now it's limited to apples, cherries, and peaches, I have a fear that I'll develop more and more intolerances as time passes (which is what I've been told is the pattern). The worst is that people who don't know about OAS think that I'm exaggerating, or just trying to avoid foods I don't like. Nope, trust me, this is real!
I'm sorry! Hopefully you can get some help from a nutritionist like kaplods suggested.