I have to agree with the others. We don't mind helping out by voting for you at all! With you missing so many letters the membership might be the way to go. If doing the membership isn't possible for you and you don't mind waiting, you can request Cuties to vote. Keep in mind that isn't a guarantee you'll get your letters.
The only advise I have is to purchase a membership. Voting is like asking Miss Veronika and that does not work very well since everyone has a different wish. She can't fullfill them all.
You could always buy the set being you missed so many of them. Either that or buy a membership and you can have all the designs.