Here's an all grain conversion from beersmith:
4 Oz Black Patent Malt
6 Oz Chocolate MAlt
8 Oz Carapils/Dextrine (In place of maltodextrine from OP)
1 lb Caramel Wheat malt
2 lb caramel/crystal malt 30L
2lb Wheat malt
10lb Pale Malt (2 row)
I brewed this BIAB in a 10 gallon pot with 7.5...