There is zero chance a speed bead will work on a side by side.
I handled a bobwhite the other day in a gun store and it seemed to me that it wouldn't be too hard to drill and tap the metal between the barrels close to the receiver for a base plate and then mount the site of your choice.
There will likely be an issue related to the barrels hitting different points of impact.
Keep us posted on what you do as I've thought about a similar project.
As an aside, you can get the cz bobwhite in their All Terrain finish, which includes matte finish wood and cerakote on the metal.