So it took having a week off over the holidays to get to do this right, but I've finally done it! So here's my 'report'. Sorry it took so long!
First off, I should note that I had never gotten the 2019 Ankor's shaders working, so I've been using the 2018 ones in my CFS3 installs. I think that's what I did the first time out and, as previously noted, TOW started, but consistently crapped out several minutes in, flying or not. Trashing that install completely, here's exactly what I did this time:
1. In the install files, fixed ACC_city_block_6.xdp to add the missing </DamageBoxes> closing tag at line 11.
2. Copied the TOW directory to my preferred C: drive location.
4. Copied in cfs3.exe and MultiCFS3.exe.
5. Ran MultiCFS3.exe.
6. Copied in Ankor's 2019 shaders.
7. Ran cfs3config.exe.
8. Copied in A.I.Radar.exe.
9. Ran A.I.Radar.exe (successfully).
10. Ran cfs3.exe (failed after splash screen).
Fix attempts:
As I've said, I've never been successful with the 2019 shaders, so I copied in the 2018 ones (overwriting) and then the 2019 ones again (overwriting). Now TOW starts successfully. I am now able to fly the remarkable missions with no apparent problems whether 10 minutes or half an hour.
However, a problem I occasionally suffer with ETO is much more prevalent in TOW. It will crap out either after leaving the mission (before the debrief screen) or when closing the debrief screen (I can look at my stats and such but trying to get back to the main screen is when I almost always craps out).
So my humble conclusion is that it's more of a shader issue (maybe I have something set wrong somewhere?), rather than a TOW issue, although as I said, the issue is much more prominent in TOW. Any advice welcome!