Would it be feasible to use this method of fishing on smaller systems such as the vedder/chilliwack or harrison as an alternative to float fishing for springs?
This method is not as appropriate for smaller systems where you can cover the waters with either float fishing or spincasting. That being said, some anglers use it in the Vedder Canal from time to time. Perhaps it is also doable at the Lower stretch of the Harrison River where it is wider, but again it depends on what others are using around you so you do not disrupt their fishing.
One question... How do you rig up a second hook, as allowed for tidal Fraser? Do you add another "steel wire", or do you rig a second hook to the terminal end?
In the Tidal Fraser River, you use two steel wires to hook up the two hooks (basically duplicates). Also, the leader would be a lot shorter and a spin n glow is not used, you simply use bait on the hook in the Tidal Fraser River due to the lack of swift current.