5820 - Three Monitors on Two Video Cards

I have a Precision 5820 Tower Workstation (i9/10900x/Win 10) that came with an nVidia Quadro Pro P2200, driving a Samsung Oddysey G9 (5120x1440) via an 8K DisplayPort cable.

I also have two other monitors I use with this system: a Dell 3007 WFP (2560x1600, turned portrait for displaying book pages), and a Dell 2405 FPW. 

The 2405 has VGA inputs, so it's easy to drive from just about anything.

The 3007 has ONLY a DVI-Dual Link interface, and when I bought the PC (12/2020), my research said that DP-to-DVI  (single link) was simple enough, but that DP-to-DVI-Dual was problematic, and the better adapters I saw at the time were in the $70-80 range: pricey for a conversion gadget that seemed to come with some caveats anyway.

Given what I had found about DP->DIV-Dual, I thought it would be easier to get a cheap second video card to drive the older monitors, so I picked up an nVidia GeForce GT710 for about $50 at BesyBuy.  It has DVI-D and HDMI (and I'm using an HDMI-to-VGA cable for the 2405).  So the new Samsung is on the Quadro Pro P2200, and the other two older monitors are on the other card.  This has worked well for nearly three years.

A few weeks ago, I apparently received a driver update that threw things into chaos.  The Samsung (my primary monitor) was not being recognized, and it kept trying to run at some awful non-native resolution (like 3840x1080, IIRC)  that made text look terrible.

I finally got drivers and nVidia control panel software installed to the point that things were working at the proper resolution, but then, every time the PC blanked the monitors (it never suspends or sleeps), when I moved the mouse to wake it up, ALL of my windows were moved to the portrait momtior (1600x2560), and resized to a width of no more than 1600.

I finally got THAT resolved by re-installing the Quadro Pro P2200 drivers from Dell's support page, and the GT710 drivers from nVidia for the other card.  I also had to remove some hidden "Generic PnP monitors" from Device Manager.

Now what I have is the 2200 card with a yellow exclamation mark, saying "This device is not working properly because Windows cannot load the drivers required for this device. (Code 31)...The I/O device is configured incorrectly or the configuration parameters to the driver are incorrect" in device manager" (yet everything seems to be working, and windows don't move around on sleep, but after my next reboot, who knows?).

The  2200 driver is 31.0.15.3667 (07/12/2023)

The GT710 driver is 30.0.14.7464 (10/10/23)

When I go to the nVidia site and look for drivers for the 710, it takes me to https://www.nvidia.com/Download/driverResults.aspx/214109/en-us/ (GeForce Security Update Driver 474.64 - 10/31/2023).

When I go check nVidia for the Quadro Pro P2200 driver, i end up at https://www.nvidia.com/Download/driverResults.aspx/214098/en-us/ (nVidia RTX / Quadro Desktop and Notebook Driver Release 535 (10/31/2023).

The Dell Driver webpage says that the driver I just downloaded and attempted to install is 31.0.15.3667, from 9/14/2023, and that's the one that Windows is barking about.

I don't seem to be able to have both of these in the sytem at the same time (installing the driver for one card seems to mess up the driver for the other), so I'm not sure now how to get back to the point where I had the two cards driving the three monitors, but it was working great until a couple of months ago.  So, I guess I have two questions:

1) Is there a way to get these two cards to co-exist in one PC with current drivers, and if not

2) Is the "DisplayPort DP to DVI-D Male Dual Link Cable 6ft" adapter cable I see on Amazon (for eight bucks with a 4.2 out of 5 rating) likely to actually work (has DP->DVI-Dual conversion come a long way in the last three years)?  If so, then I can just drive all four from the Quadro and get rid of the GT710.  I don't mind spending $8 to solve this one -- my time is worth more than that!

Any suggestions are welcome!  Thanks in advance