It makes no sense to try booting with proprietary drivers in this case – the free drivers should be adequate – if it boots, concern yourself with proprietary drivers only then.
Another thought:-
When booting a Linux ISO with Ventoy, there are two boot modes you can choose from – “Normal” and “Grub” – you can also experiment with those (the common logic is: if one fails, use the other – presuming everything else is in place).
If you’re interested, one of our members creates his own Manjaro spins quite regularly. As you’ll see, @Jim.B has quite a few listed in the SbK Spins category. These are of course Community releases with only uunofficial support from Manjaro members, but may be worth looking at.
I understand his Cinnamon release is fairly popular, but the LXQt release would be a lot lighter.
Regards.