Star Alliance benefits when putting points on a card without status

I've achieved Star Alliance gold through matching Velocity Platinum to United Premier Platinum.

Technically, Star Alliance rules require your status to be on the boarding pass for the benefits to be enjoyed, although it's up to each airline whether they want to go the extra mile, so to speak, and do the 'manual' process to permit lounge entry etc. based on a different Star Alliance card.

Note, however, that some airlines have cracked down on this: United in particular. Some people were checking-in using their Star Alliance Gold status to get a boarding pass with a higher boarding priority, screenshotting that, and then changing their frequent flyer number to a different program sans status to credit miles elsewhere, but using the higher-priority boarding pass to skip the boarding queues. Now their systems will pick this up and send you to the back of the line, because the system won't see your Star Alliance Gold status, it'll only show what's in the system when the boarding pass is scanned (they have boarding lanes and gates that can be programmed that "only group 1 is boarding now and reject all others", for example), so it's really up to each airline.

Thanks! I guess at Sydney you get two chances with with KrisFlyer and Air NZ being next to each other.

I'm unsure about SQ, but i was in this exact situation 2 weeks ago flying thai, using my status match from united like yourself. My thai membership is only silver and I'd prefer to have credited to that account, but as expected if I wanted to use my delta membership for the benefits I had to commit to putting the points there. I won't ever use the points in the united account hence why, like youself with SQ, I wanted to put the points into thai but use delta for the benefits. I asked specifically about this on check in and at lounge.

Ok I'm going to get VA Platinum renewed fairly easily, so might just put it on United and see if I can retain *A gold. Been eying off Asiana with the 40k miles/2 year qualification period and the possibility for lifetime gold, but not sure if its worth it if you need to fight at the airport for a year while you get the status up. Problem with United is it goes by the calendar year so need to make sure your xmas flights are on the right side of the new year.

I did this with SQ in 2016 and it worked. Had a status match for gold with TK but had KF number against the booking. I just waved the card around whenever i needed access to an airport benefit and no problems at MEL, SIN and LHR.