Want to bind a Localizable property, to give end user choice for its own DateTime Format

Goal:

The end user must be able to set its own date time format.

Option that doesn't solve all of my problems:

the property FormatToken can be set for the Date Time Picker Widget to a Localization Token.

Same goes for Grid widget Column render settings.

Problem:

The Localization Token only sets the format for the dateTime string at a langue lvl.

Part of the solution:

I let the end user set its own DateTime Display settings, save that as User parameters.

A service that converts the DateTime to the string using the User parameters.

So, I call the service so when i need to display DateTime in a Grid or label so it converts it.

So displaying datetime format on a grid or label is solved. And works fine.

unsolved part:

But i cant do the same thing for the Date Time Picker Widget.

Because DateDelimiter and FormatToken properties are only Localizable and not Bindable i cant set them.

I can think of 2 dirty solutions

1 when i set the Localization Token from a i can make a service that overwrites the Token before displaying the Time Picker Widget.

2 make a Localization Table for each user.

Well my dirty solutions are so dirty that they should never be implemented.

Questions:

Can anyone think of a good solution?

Did any of you try to do this before?

Is there a way bind a Localization Token to a User parameter?(this would solve everything, and would be very powerful feature)