v11 should already be capable. Attachments should work so long as they haven't been set as WYSIWYG-editable (which gets rid of the Tempcode in MEDIA_IMAGE_WEBSAFE.tpl that makes it work). Custom image fields on Comcode pages should work as next precedence.
Or you can edit HTML_HEAD.tpl and remove this:
<meta property="og:image" content="{$METADATA*,image}" />
<meta property="og:image:width" content="{$IMG_WIDTH*,{$METADATA,image}}" />
<meta property="og:image:height" content="{$IMG_HEIGHT*,{$METADATA,image}}" />
to just let agents choose on their own which image to use.
(Click to enlarge)
(Click to enlarge)
Or you can edit HTML_HEAD.tpl and remove this:
<meta property="og:image" content="{$METADATA*,image}" />
<meta property="og:image:width" content="{$IMG_WIDTH*,{$METADATA,image}}" />
<meta property="og:image:height" content="{$IMG_HEIGHT*,{$METADATA,image}}" />
to just let agents choose on their own which image to use.