Ouch. I only roll for the guaranteed 5* gachas, but I have so many LE Servants that it's kinda silly. Okita, Scathach, Shirou, Iskander, Nero Bride...

I think the only not-LE 5* I have are Jeanne and Nightingale. Somehow.

/GO discussion aside... For Double summon, just take out one of the skills a servant would have that isn't class-specific and sub the alternate class skill in instead.