After the big rap from Brauluver, I thought that I should chime in.
I find the orange peel to be a minor flavour, and mostly there for bitterness (as the Belgians historically were held to ransom for hops and malt by the monopolist Germans, and topped up their grain bill with raw wheat, their hop flavour with coriander and their hop bitterness with bitter orange peel, which they could source cheaply).
Anyway, most of my flavour comes from the coriander and flavour Saaz.
For orange peel, have tested some Chinese orange peel given to me by Borret (thanks, buddy). Have also peeled fresh oranges with a potato peeler, to leave the pith behind, and added to the brew without pre-drying. I took some advice from Eric Young in an old Ausbeer magazine, and used Valencia orange, but have since used Navel on one occasion. I think that you will get more volatiles from the orange peel if you use it fresh. Am happy if someone wants to let me know why fresh peel is a bad thing, if U can give me a valid reason. I am no expert, and have relied on the sage advice of others which has worked 4 me, and am happy to advise of my experience. Hope this helps.
I may have mentioned this some time ago, but U can use orange flower (similar to rose water) from the health food shop. It may not be traditional, but it seems to help.
Re wheat malt extracts: As wheat beers have been my faves since early daze, I have some knowledge of brewing with LME and DME (malt and wheat malt). Liquid malt seems to leave less body in the beer, so if U prefer a drier wheat style, please use it. You can increase body and mouthfeel (residual sugars) by combining liquid and dry malt extracts. However, my best estimate of a true imported Weizen, made from extract has involved Muntons Wheat DME and Muntons light spraymalt (DME) at 60/40 ratio, and I have some trophies to support this. Only once did I try all wheat DME, and produced an infected beer. Sad to admit, but there's no point being dishonest. Maybe I'll try it again soon.
The most important thing is use the right yeast. Can't normally go wrong with W3068 (Weihenstephan Wheat). There may exceptions, so I allow for those. I concede that these beers may need to be fermented cool, say 16-20C, but can still be fermented at higher temps, if U have little temp control, as they don't produce a lot of fusels.
I'm off now to make a mid-strength extract wheat. Byeee...
Seth out