You should try OpenCore legacy patcher - it’ll run Monterey - my 2012 MBP runs it perfectly. It’ll run Ventura too but there’s the risk of a point update breaking compatibility.
3rd party code modifying macOS. I do not have the ability to audit it and value my financial data & username/passwords.
Another consideration is hardware failures of my 2012 iMac
- HDD of my Fusion Drive is dead so I'm running on 121GB SSD that is <0.5GB/s
- Left speaker is blown out
- LED backlit located at the bottom of the LCD is dimming
- My iMac will turn 10yo by Valentine's Day 2023
Not to mention this iMac has a max power of >200W while a 2023 replacement is expected to use <100W.
I'm ambivelent to give time to do OpenCore.
I get there's a large enthusiast community on it but perhaps they do not factor in the points I made above as important.
macOS Monterey received its latest Software Update yesterday. So it should be getting its final Security Update between WWDC 2023 & December 2023.
If my last laptop was a 2011 MBP 13" 32nm I'd bought a 2021 MBP 16" 5nm the week of release as a form of preventative maintenance.