Sun Type 6 USB keyboard: a driver or a filter?

Hi all,

Got a Sun Type 6 USB keyboard, like this:
https://deskthority.net/wiki/Sun_Type_6
The task is, I do need all the keys working using Windows 7.
Yes, especially the left block of 10 keys.
The keyboard itself does produce all the scan codes but Windows
just ignores them. Right now I am using it as a generic keyboard;
the ID is: HID\VID_0430&PID_0005&REV_0200

Few times I have looked the net for a solution but still found
nothing. There is no problem to have this keyboard working with
any Unix (it takes just few configuration changes), but if I get
things right a driver is necessary for Windows.

Think I need some typical kind of soft used for a keyboard with extra keys.
And looks like I have to develop it myself.

The point is to map the extra scan codes to something, say F13-F24,
and there will be no problem to interpret them.

Please tell if I need a driver or a key filter and what kind of it?
Maybe there is something alike already, just not to develop from scratch?