Strength training for true grip / Chinese grip iron X

Hi! I'm currently working on the true grip iron X. Starting from a true grip aysha, I can low my body horizontal to the ground, but I'm struggling to either stay in that position and try to rotate my body into iron X or pull myself back up to the pole. I can't hold the aysha long enough... I've checked my arms position, they are slightly bent as I think they should be (as I have seen in Veena's videos). I think I lack some biceps strength... How can I work on my arms strength, without getting into true grip aysha position (which is tiring for my lower arm...)? Are there any push-pull moves I can do with the pole or with weights to target those muscles? Thanks a lot!