Welcome from a neighbor to the north!
Sounds like a LANG Hybrid might meet most of your requirements~! Mine has a smoking chamber with a charcoal chamber on the front. Not sure where you would put your dutch oven, but I'm sure it would fit in there somewhere!
Good luck and enjoy the forum!
CMJ - KCBS
CBJ - MBN, NCBS, NCPC, NCBBQA
OBJ - BBQCritic.com
CTC - KCBS
Pitmaster and chef - "4 Lil' Pigs" Competition BBQ Team
Author of "A 'Q' Review"
Lang Hybrid Smoker, BDS, Holland "Epic"