First of all, is there such a pattern as て-form + でも? I can't find it in my grammar dictionary. If there is, is it related to the て-form + も pattern, meaning something like "even if"? What is the ...
ALC can give several examples of this, not only in 連れてって: いつ私たちを湖に連れてってくれるの？ When are you going to take us to the lake? これ、帰りに叔母さんとこ、持ってってちょうだい。Will you take this to your aunt on your way home ...