I can’t think of a standalone gui app that does this (and a simple google search didn’t find one).
If you have a gui desktop (gnome,kde,xfce,lxqt,enlightenment,budgie…) it will have a built in function in it’s settings to do this, or leverage one of the parent ones (ie budgie is based on gnome, lxqt on kde).
If your custom environment is pared down to the point where you don’t have an equivalent to gnome-system-tools and don’t want to install it, you might have to just use date at the command line.

I think all the existing answers are on the basis of creating a new Linux VM.

And if I understand you correctly, you already have a bare metal Linux install that you want to run whilst Windows is up.

This is the best search result I could find: https://forums.virtualbox.org/viewtopic.php?t=93437

It sounds like Virtualbox will indeed create a pseudo vhdx that points to a real partition, but windows is going to give you permissions drama.

The above link is out of date though, so its best viewed as info rather than guide.

Good luck.

A lockdown browser?

If you need to use windows because of a software issue, not a hardware issue, you’re probably best off running windows in a VM.
That way your linux install is making the WPA3 connection, and as far as the Windows install is concerned, it’s on a wired lan.
This has the added benefit of not having to reboot, you just always start linux and turn the windows VM on and off as required.