I have no experience with any of them, but I would give advantage to ender 3 v3 and sovol sv06 because they have smooth rods while neptune and kobra use wheels. You have to be ready to thinker, tune, upgrade and fix because you are buying super cheap bed slinger, but I guess you know that already. I dont know if you can get voron v0.2 kit for around 300€, but that might be beter investment if you are ok with smaller print volume.

Nesting is nasty 🙃

Like others said, consistent leveling can be a pain on cheap printers like ender. Your printer have 4 leveling screws while you need only 3 points to define a plane. 4 screws are recipe for problems on such a small plate, and then they also ship deformed bed plates or frame…

There are better quality machines available, but there are also so many people with enders that print amazingly well. So you have to decide if you want to dig deep enough to fix/upgrade/tune/thinker until quality is accaptable. Some people enjoy tuning more than printing, while some want to spend money on more like plug&play experience

Another options is to weld the existing hinge

Its probably the easiest to buy another hinge for glass that doesnt require holes on glass like

Then mount it above the broken hinge.

I think metal printing and/or CNC machining could be way over expensive, but please let us know the price if you go that route. If you really want to solve this with 3D printing consider printing it from plastic and reinforcing it with steel (wire, screws, tube, or reuse existing hinge parts), but it will never look good as if you buy a hinge