can one also say, " Mi helpos lerni vin."? would the accusitive make it clear that i would be helping the you learn and not me helping myself to learn about you?
It would be better not to take liberties with word order here. Such a sentence will more likely mean I will help to learn you or just be highly ambiguous in cases where the infinitive can also take a direct object - like here.
For example, in Mi helpos lerni ĝin/lingvon, the accusative would naturally be understood as being the object of 'lerni', but not of 'helpos'.