The easy way to do it would be to replace the 2-row, chocolate, caramel with dark DME:
14 lbs Dark DME
6 oz roasted barley
6 oz Carafa III
8 oz Honey Malt.
It would be a little closer to the original recipe if you use 14 lbs Light DME to replace the 2-row and keep all the specialty grains as steeping grains.
My book has a table for these conversions on page 15. On page 198 there is a table of conversions between all grain and DME for most of the different types of malt extract.