I noticed there's a post in this thread wherein someone reported being offered UA codeshare options via SDC. What do you think are the chances I could do a SDC, assuming my fare class is available, from XXX-YYY (UA) to XXX-ZZZ-YYY, with just the one hour ZZZ-YYY leg on LH metal with a UA flight number? I'm not feeling too good about my upgrade clearing on XXX-YYY but it will definitely clear on XXX-ZZZ so that's why this is a compelling option.