If someone in a non-restricted country fills out KYC (your mule) and is confronted with evidence of logging from a restricted country, they simply say "I was travelling and logged in at a friend's house".
If they say "you are using a different device", the mule says "I got another phone" or something reasonable.
Just have your story ready. But be prepared for the mule to take all your funds, or demand more than you initially bargain for. In which case, you could consider asking for collateral, though the mule might then think they are being scammed.
Just use common sense, plan and rehearse.
It is still impossible to make excuses like that, what if they want evidence that you have travelled to your friends house? HK to US is pretty far and the travelling expenses amount would be over those 1200 USD in the account so it will be pretty useless. Unless you could find a mule that has already travelled for US recently.