The issue is not whether it is possible but whether there is anyone with enough knowledge and skill that has the time to do it. My first suggestion is to file a package request at OpenMandriva Issues. My second suggestion is go to OpenMandriva Chat and talk to developers see if you can find someone that can do this and has the time. Better is to do both.
An alternative to fixing your specific issue would be to ask developers if the issue can be fixed and multiple monitors made to work in with nouveau driver.
Another alternative is to install the nVidia driver from the link you posted. You may need to ask for help at the nVidia Linux forum. That is where you can ask what kernels this driver will work with for instance.
Developers typically do not spend time in this forum it is mostly users helping other users. Developers my see a users post but that is not something to rely on.
The reason nVidia Linux drivers are a constant problem for smaller Linux distros like OpenMandriva is because of nVida’s ways of doing things. Go to the 48th minute of the video for the nVidia question.