Ok ok so I shot myself in the foot with the "matter of minutes" comment, anyhoo here's what you need to do:
Go into HyperHQ.exe and add a system eg "Gun Games"
Copy an xml from another system into the Gun Games database folder and rename it Gun Games.
Edit Gun Games xml and delete everything in between </header> and </menu>.
Go into each systems xml and copy the any gun game info you want to use in your Gun Games wheel, an easy way to this is click find and enter <genre>Gun</genre>. MAME has a completely separate xml just for gun games so that one is p easy.
Copy each game section into your new Gun Games xml.
Once you have your xml completed, lets move on.
Loadup HyperlaunchHQ:
Click "Gun Games" tab on the left.
Click Emulators up top
Choose which ever emulator has the most gun games as the default emulator
For the rom path you need to add all the paths for wherever your gun game roms reside eg:
"C:\HyperSpin\Emulators\Sega Model 2\roms"
"C:\HyperSpin\Emulators\Sony Playstation\roms"
"C:\HyperSpin\Emulators\Sega Naomi\demul32-0.5.7\roms"
etc etc
Now, heres hoping you created any alternative emulators under the global tab and didn't make them system specific, I bet you made them system specific like I did lol, no matter theres an easy fix for this if you need it.
Click Games tab at the top
Click alternative emulator tab
Click +
Now for every game that doesn't use the default emulator you selected at the beginning of this process you need to fill in these fields, including the system it belongs to.
All thats left is to copy the media from each individual system into your Gun Games system media folder.
And breathe.
Sorry its a bit cluttered but wanted to type this while it was still fresh in memory lol
Update
It would be great if there was a way of using the media from its original location, I don't know about you guys but I'm not willing to duplicate all the videos, themes and wheel art images, it would eat up too much storage space.