Translating variation types: variation title field

hello

i am trying to find the way to translate the variation title with entity translation.
i use title module to be able to translate.

i put here my configuration:
in the "product variation" field edit form, i dont select "Auto generate the product title" to be able to write the title.
in the variation title field, i set it to be translatable.

if in the product display i set the "product variation" field translatable, when i go to translate, i get all fields to be translated (like SKU), even if they are set as untranslatable in the variation. that i dont want because i will need a different sku for each language.
if i dont set it translatable, then when i go to the translation form, the field doesnt show. neither i get a translate tab when i edit the variation only.

any tip on how to solve this?
other way that i can edit the other languages titles to be able to edit them?
thanks a lot :)