I still have no Apple Device drivers anywhere in my Device Manager
Are you still interested in pursuing this? If so let's forget about iTunes for the moment. Let's see if Windows is able to recognise your device at all? Regardless of whether you have iTunes installed or not, W10 should see your iPhone as a camera IF you have pictures in Camera Roll. Let's try this:
Take two new pictures with your phone. Restart the phone and then make sure they show up in Camera Roll.
Reboot your W10 computer, wait 5 minutes for all to load (on a new fast computer 1-2 minutes is all).
Connect your iPhone to the computer, open File Explorer and expand the folder structure on the left. Do you see the phone as shown below? Note that sometimes F.E. does not recognise the phone immediately. If it does not, unplug the phone and plug again, wait a couple of minutes or so. If still no go, disconnect, reboot PC again, connect and check. Try connecting at least 3 times. Give it 5 minutes or more before you give up.
What Antivirus are you using? McAfee (and Norton to a lesser degree) is notorious for creating issues with iPhones. If you cannot see the phone as above, disable the AV and reboot PC. However when you reboot, the AV it is likely to start automatically again so depending on your AV, disable it such that it will not restart on a reboot. It is imperative that the PC is rebooted without the AV being active. Just turning it off will not do.
Repeat connecting as above. Do you now see the iPhone? If so then go to Control Panel > Device Manager > and with the phone connected verify that it shows up under USB Controllers as below. If so you driver is there and if you are still unable to see the iPhone in iTunes follow the steps here:
If iTunes still does not detect your phone follow the steps below to the letter but make sure your AV is not running. FWIW I am using Windows Defender on my W10 computer and have never had viruses or issues. I also use Malwarebytes (the passive version).
Remove and reinstall iTunes and related software components for Windows 7 and later - Apple Support
If you are still having issues please take a look at the following User Tip from the most knowledgeable iTunes expert on this forum, a chap by the user name of turingtest2 who is in London (I suspect you are in the UK since you are a pensioner).
Troubleshooting issues with iTunes for Windows updates
If all else fails, I can ask tt2 to respond to you here but before I do that, try the steps above and post back... Good luck.