I've added scotch to my ale before...but sadly (in this context) it does not even step into the same room as the peated ale.
I really can't come up with anything that would let an extract brewer try this. It's simply based too strongly on the peated malt. A partial mash is all I can come up with, and I think that would be both very costly and much less effective.
Or you could try peating/smoking your malt extract, but I have serious doubts about that working.
Maybe it's time for trying a small 1-2 gal all grain batch???