Wheat extract is usually 50/50 of 60/40 wheat to pale/pils, so something like (assuming 75% eff):
8 lbs pale
3.5 lbs Wheat Malt
1lbs Flaked Oats
.5lbs Crystal 20L
.5lbs Belgian Aromatic
.5lbs Belgian Caravienne 24L
1 lb honey
You may need to cut your hops a bit if you did a partial boil, but the brewer should be able to help you out (big systems get better hop eff than homebrewers anyway).
Same deal on the spices, I might hold back a bit, you can always add more.
The brewer may not want to use a blend of yeasts for cost reasons, but you can talk about it.
You may also want to consider kegging the beer after you brew it instead of the other way around