The crt_emudriver install guides show you can install it and then use your current LCD with it. It's the VMM step that switches over to low resolutions. So you can give crt_emudriver a go first, no need for the cable until you can see the driver is working with that APU (if it does). And you can always switch back and install regular drivers after that, though ideally you want to install crt_emudriver over a fresh copy of windows.
In fact, to test your APU properly, you'll then go through the same steps as the guy in the post you linked. I don't have VMM in front of me right now, but i think you could use the guide for the 5000 series cards and up on the same website you linked to, BUT once the driver is installed and you're up to the VMM step, make sure to try this:
-Make sure to pick the arcade_15_31 monitor preset
-Copy the user_modes.ini file and call it what you want, edit it to make sure there's a mode in there called 640x480@60.0000 or whatever the format is, and not one for a 480 interlaced mode @30.0000. And also make sure there's modes like 320x240@60.0000. Then make sure to select this file as the list of modes to generate.
-Go through the VMM step of the guide steps of the guide to generate modes, and install them.
Now you should have some 15kHz modes installed, and some 31kHz modes so your LCD will still show up - i hope. Two things can go wrong, so pay attention. One, it doesn't work, and VMM can't install any 15kHZ modes - ok, you've lost nothing. Two, VMM switches to a weird mode your LCD can't handle and you can no longer boot into a visible desktop. I the latter case you might need to reinstall windows if you can't virtually get into the machine.
Hopefully Calamity can confirm that VMM would pick 640x480p as the default if you've generated it correctly. You could even try reducing the user modes file to two entries, one for 640x480@60.000 and one for 320x240@60.0000. Windows should always pick the larger, there.
If this works, you won't be able to test the 15kHz modes like 240p, but even installing them is a step further than the guy on your link got. And if they do install, i'd say it's safe to presume they work, everything else being equal - meaning i know nothing about your monitor or cable
Keen to hear how you get on.
EDIT: Remember that the above is only to test your APU using your LCD. To use a real 15kHz screen, at minimum you'll want to redo the VMM step from the guide and make sure you don't install anything over 15kHz (so, using the arcade_15 or generic_15 present, not the arcade_15_31 one). 480i is safe for an old SCART CRT, but 480p is not.
The other option is to just follow the crt_emudriver install guide as it's laid out, and if when you get to the VMM step the LCD goes out of range, you know it worked. Reinstall windows and look into your SCART cable