Can check out all the mods I did when I had TWD here:
https://pinside.com/pinball/forum/topic/twd-club-only-walkers-not-welcome?tq&tu=pomc
I opted to go without the El Wire for my prison fence - El Wire just wasn't the look I wanted. But I also bought El Wire dirt cheap, like $6 for 16' with free shipping. The "relay" (or whatever it is) to connect the El Wire to the GI lighting is only $14. If I recall it was so you could run the El Wire on 5v from the GI.
The Prison fence was just $2 gutter guards from Home Depot.
I still have the El Wire and will keep it for possible use down the road. But yeah, this mod is WAY WAY overpriced considering how cheap the material and parts are.