What(if any) is the best or simplest way of converting my trucks front end?
When you say convert do you mean to disk brakes or are you wanting something else?
The assumption in the responses seems to be disks, but I don't find that clearly in your original post.
The axle used on Advance Design trucks easily swaps to Art Deco trucks, but I don't know if it will work as early as your 37. It may be a trivial swap.
Swap to an Advance Design 1-ton or 1-1/2 ton axle and you have the option of Bendix type drum brakes. That may be enough to satisfy your needs, and the axle is the same on a 1-ton and a standard 1-1/2 ton.
A couple of people have worked out dual wheel disk conversions for the 1-ton using that same Advance Design axle. You may find that a reasonable solution.
If your desires are more than just brakes what else are you trying to achieve?