This is intriguing, but I'm not sure I fully understand. Let's start with the kit required:
1 Bar end lever
2 long gear cable + some outer
3 cable stop on top tube near head lug
4 Sturmey pulley wheel mounted below seat lug
5 below bb cable guide
6 A front mech
I've no problem with 1 to 5. All I want to do is run the cable under the bb and up to pinch bolt on the front changer. Many mountain bikes run the cable along the top tube and down the seat tube to the pinch bolt but the routing is on the lh side of the frame into a top pull mech. My solution on the 'Tour of Britain' would be to route on the rh side. I thought all I'd need would be a standard bottom pull mech and a cable guide positioned under the bb to rotate the cable line slightly from right side to left and then up to the pinch bolt.
Any reason why it cannot it be that simple?
'53 Viking Tour of Britain. '89 GT Karakoram. '91 GT Karakoram. '93 Raleigh Nitro. '95 Orange C16R. '98 GT Avalanche LE. 2x'00 GT Avalanche 0.0. '09 Boardman Pro hardtail.