Wow ...
The post you listed was started by me when I was 10 years younger.
Almost worked, but
it really didn't
When I disbled RefreshOnPasteImage, these large images pasted fine and no longer disappeared. But, once I switched info items, going back to the one containing the large image not longer showed it. This is true even when I do ctrl+s to save it.
In other words, the image shows as long as you don't switch info items. For the smaller images, they always work fine.
Please, keep this on your radar.