You're into persons suffering combined less severe amelia/ genu valgum/crania and anencephaly? Cool. Glad to see you are open minded to be attracted someone with several congenital diseases.
I cannot see myself being attracted sexually to those severely disabled before the fact I met them because of how much work you need to put in supporting your significant other emotionally and even financially. If my significant other becomes disabled after I met them and I have grown attached to them, I can see myself taking on the burden to make the relationship work but other than that, this is a bad proposition unless you are financially and mentally stable to handle such a gargantuan task.