I'm flying LHR to SIN in a few months in Y, but have Star Alliance Gold through Turkish Airlines (Full disclosure, this was a status match from KL and I'm not really bothered about miles on there).

When booking I signed up for a KrisFlyer account, which was initially attached to the booking.

I was able to switch the ff number on the booking, and it now shows up with star alliance gold on the booking, but I cant manage the booking in the Singapore Airlines app, instead I have to keep remembering the booking number.

My question is, given i dont care where the miles will go (im usually on KLM/AF) is there any beneift to having the TK number on the SQ booking? Would i just be able to flash my TK pass to access the fast track, lounge and checkin if I went back to the SQ number or should I just try to remember the booking code?