credit the miles to right place
Can't comment on the options, but I would recommend you to credit the EK miles to UA MP instead of skywards as this will give you the option to spend them in *A europe or on some UA flight. I have plenty of miles in Skyward which I acumulated over the last 6 years but never found a good award so far an always scrambled to get tiny upgrades before the miles expired.
Regards Oliver