You can get one of these adapters
https://www.amazon.com/MAYFLASH-Bluetooth-Controller-Raspberry-Compatible/dp/B079B5KHWQ
It let's you use any controller with your PS3.
Just downloaded it on your PC and transfer the .vpk file to your Vita with Vitashell. Then install the .vpk file with Vitashell. Here's the link for the file
https://github.com/ONElua/AutoPlugin2/releases
Convert the drive to NTFS. Place the ISOs in PS3ISO folder. Run Managunz. Here is a link to Managunz https://store.brewology.com/ahomebrew.php?brewid=284
Unpack the .iso file from the zip.
Put it on your external hard drive in the PS3ISO folder in the root.
Install ManaGunz from here
https://store.brewology.com/ahomebrew.php?brewid=284#google_vignette
Start the app and the games should show up.
Here's a guide https://learn.microsoft.com/en-us/windows-server/storage/disk-management/change-a-gpt-disk-into-an-mbr-disk
Make sure you backup your files first if you need them.
Before you try that go on Multiman and all the way to the left select Switch to mmCM mode and then select Scan...