I'm adding support for a few things that will make it a lot easier if you are "importing" pics from an EGA game to the SCI 1.1 template.
You should be able to just paste the commands from an EGA pic into a VGA pic. Invalid commands will then be removed (i.e. the EGA palette commands, and the pen commands).
Then, there will be an option to remove all setvisual commands (since you will have pasted the visual screen as the pic background image).
This should get you *most* of the way there. The main remaining problem are the fill bounaries for the pri and control screens. Pen commands have been removed, and the visual lines/etc... have been removed. This means some boundaries have been lost, so you'll need to go back through the vector commands and touch things up here and there.
I'm using this functionality for part of the "explore SCI1.1" sample I'm making, and it only takes a minute or two to import a pic from EGA now.