Another thought based on several recommendations I've seen on here for the Golden Nib: Silvertip Badger Knots : Fountain Pen parts - NIBS, - Wholesale Fountain Pen Ink - Golden Nib AZ.

After perusing their website, it seems I can get a nice silvertip badger knot and handle together for less than $50, then simply glue them up for an awesome brush. I may have to try that!