We got the same Goal & Idea, except I’d add in Cucumis melo into the crosses too! I’d Cross C. metuliferus x C. anguria 1st, then cross in C. melo & finnally attempt crossing with C. sativus. Use Mentor Pollination by mixing pollens to smooth out any fertility issues.
I think you’ll find this super useful!
I hope we can work together to make it happen! Perhaps even trade germasplasm too! I’d love to get me some wild/feral C. metuliferus & C. anguria.