Hi,
HDMI to VGA adapters are always a lottery. 😞
There are some great picture quality adapters, but majority is really poor.
From my experience, I can only recommend legacy DeLock series (with red/black HDMI plug), but they are hard to find and rather expensive.
Personally, considering picture quality, I would go with RGB Dual - it is safe and reliable option.
As for jamma to USB control adapters, unfortunately I have no experience at all.
Hope this helps.