You would have to rewrite all the sources to do that. And it wouldn't be very easy currently because first off you can't use Sierra games sources since SCI Studio doesn't decompile them.
Second, SCI Studio VGA isn't released so there isn't a built in point and click interface that you could use, you would have to design something all on your own.
As for convertering, there is no converter specifically, you have to rewrite the games into the different format.