Converting to Portable Mode

I messed up. I upgraded to Windows Enterprise and had to reinstall all of my applications on my computer.
My husband and I use kodi across both of our accounts, so to make it unified I installed not in the default and set up a shortcut for portable mode. I’ve done this a few times, and did it from memory this time and flubbed it. Instead of using -p I used -P, Unbeknownst to me, I started Kodi in regular mode. Two months later (now), my husband logs on to his account when I’m not home to use Kodi and it’s not set up at all. I did some investigation and discovered my case error. It’s definitely not running in portable mode because I have C:\Users\xx\AppData\Roaming\Kodi\Userdata–this explains why my advanced settings doesn’t seem to do anything.

What’s the easiest way to go from non-portable to portable? The instructions don’t cover this and I’ve failed to find anything here in the forum (though I’ll be surprised if it hasn’t been asked). I would normally just start experimenting (back up all the settings and reinstall or try copying the documents from …Roaming\Kodi\UserData to C:\Custom Installs\Kodi\UserData

Also, any thoughts on installing kodi on the NAS where all of my media is installed? My brother-in-law will be moving in with us this summer and I’d like for him to have access to kodi from his laptop.

Here’s my setup:

Most up-to-date release of Kodi. Installed at C:\Custom Installs\Kodi
Most up-to-date release of Windows 10 Enterprise
Media files on NAS at Y:\Root\Video \Music \Photos
NAS hardware: WD My Cloud 4 TB (TB for TerriBle)

Kodi runs on the only computer in the house, my desktop. As such, I don’t keep Kodi running all the time to serve as a dedicated media server (this would be a bit more ideal for my brother-in-law who would then be able to access all the media from his PS4 via DLNA or UPNP (PS5? whatever’s current, I stopped at Xbox 360), but am open to suggestions if there’s something better out there. I’m rennovating my house, so over the next few months my NAS, gigabit switch (noisy), desktop (bulky), and other hardware will be moved to the basement from my tiny office. I currently utilizes a DisplayPort to feed the office in my monitor and HDMI to feed my television in the living room through the wall (95% of the time for Kodi). Once everything is moved, I plan to keep this setup relatively the same with the exception that the HDMI will go into a splitter to provide the same feed to any TV throughout the home. The only disadvantage I’ve found to this set up so far is that Windows sucks when it comes to display management. It works well from Kodi’s end since you can tell it what display/sound output to use and mode to start in (means I can launch Kodi in the office and it stays in the living room). Unfortunately, other programs will randomly decide to open in the other display and without installing 3rd party software, I can’t listen to music in the office while a video is playing in Kodi.

So, to recap my not super-linear thoughts:

How do I switch from non-portable mode to portable mode while preserving all of the setup I’ve done over the last few months?
What’s the best way to set stuff up to use kodi as a quasi-HTPC/media server regarding my setup or is it a good set up as is–if so, any suggestions on improvement? We’re a couple months out from redoing the high-voltage and adding low-voltage wiring to the house. I want to make sure I have a good setup planned out before we get there because once the sheetrock goes up, changing the in-wall wiring will be impossible.