According to MilesLion there is now functionality on the SQ website that allows entering different loyalty memberships for points accrual whilst entering KF membership number for status recognition (if applicable) and free on board wifi. A plus if it works correctly, but unfortunately can’t enter an alternative programs for status recognition (so no recognising VA status whilst accruing miles to SQ, that would still need to be done at a counter during checkin).
Singapore Airlines website now supports FQTV/FQTS splitting - The MileLion
Enjoy the benefits of one frequent flyer programme, while accruing miles with another- now made easy on the SIA website.
milelion.com