Change Surface Pen button behaviour on Surface 3 Windows 10

[surface33]

Hi,
I would like to change the behaviour of the top button of my pen so it could call the OneOne desktop version instead of the default app.
It seems that this was possible in Windows 8.1 .
Not anymore in Windows 10...
MS support confirmed this.
I hope they will put this feature back or someone to develop an app to do it.

If anyone has any clue ...
Thanks a lot.