I want to use the K650 keyboard with WinCompose. On the laptop, I have the mouse-menu button mapped to be the Compose key for WinCompose. But on the K650, it's an awkward key combo to do Fn-Search to achieve this.

I thought I could map the calculator key to do the mouse-menu function. But the Logi Options+ app must be doing something weird to implement its keyboard mapping, I guess doing it in Windows OS keyboard hooks. So I could never get it to work.

I also want a solution that works in Linux in a VMware guest OS, and in a Linux native install. But it looks as though Logitech doesn't have good support for VMware interoperability and Linux.