Could you please elaborate? I am not entirely sure what you are asking. If you want Elven Warriors, pledge to a elven faction so you can hire them.

Elves are multifunctional and I only need them as warriors with small arms.

Do you mean you want all elves to be warriors?

So, you want the elves to use only melee weapons? Aside from recoding them, you could use Dorwinion Elf Warriors, who exclusively use melee weapons.

Yeah, or just hire the melee units.