OK I did a bit more digging. I could not find any custom ROM available for this device. The nearest I could find is this thread in XDA Forums. That has links to the GitHub repos owned by ther person who claimed (in April 2023!) to be
working on source for custom rom development stuff.
The last commit in any of those github repos was in May 2023. So it looks like they didn’t get very far. Though thye did create a repo claiming to contain the vendor binary blobs
So, to get any custom ROM working for this device, you will be pretty much starting from scratch. To get IodeOS to work, you would need to get LineageOS built and working for the device, again starting from scratch. From what you have written I don’t think you are in a position to do this. No advice that @rik or can give you is going to get you to a point where you are able to make a custom ROM from scratch.
The Lineage OS Wiki FAQs have a question which covers this
Where are the guides so I can port LineageOS to my unsupported device?
There are none.
See what other similar devices did to get them to work.
So, I’m sorry to be discouraging, but I can’t be any more help, and I have no more to contribute to this thread.