I know this makes little sense in principle though I may be leaving Switzerland to return to Italy and based on their agreements it appears that withdrawing 2a is taxed at a much more advantageous rate than 3a.
So I was wondering if it’s possible to move the 3d pillar into the 2nd prior to leaving and eventually withdrawing?
https://finpension.ch/en/transferring-money-from-the-3rd-pillar-to-the-pension-fund/[3a to pension fund]
Hope this article sheds some light
That’s definitely a thing, eg https://finpension.ch/en/transferring-money-from-the-3rd-pillar-to-the-pension-fund/
Learned something new today 
Ah awesome, thanks for sharing! This seems like a much cleaner solution than exploiting the 30 day gap between registrations, for the Italian case at least.