The best way I can see at the moment and depending on the amount of your BVG, is to move it out of Kanton Zurich where the withdrawal of BVG tax is higher (it's taxed at retirement or if withdrawn early i.e. going to live in NON EU countries).

I will use a pension company that offers other solutions beside the vested benefit account. I will be able to invest my BVG into a fund or be able to have my own individual portfolio of shares, bonds etc. The benefits of the latter is that any dividends or interest paid will not be taxed the 35% withholding tax and I should hopefully get a much better return. I can also move bonds, shares into the BVG from my external portfolio as long as the same amount is exited at the same time. A bit complex but tax wise interesting and hopefully a better return than the interest offered on the Vested Benefits account.

I can also split my BVG into 2 separate blocked BVG accounts. 1 can be blocked till 60 and the other 65.

I still have many questions regarding the set-up and of course fees are involved but half that of UBS Private Banking.

If anybody has any experience regarding the flexible BVGs, I would be interested to hear from them.