It's been a long time but I'm closing in on a solution to The Highway Peg Quest.
Since commenting on this thread, I explored *exhaustively* buying off-the-shelf kits. There was nothing and I looked in every corner of the web. I am pleased to hear that a member of this forum is planning a restart to the MCL pegs (I think. I messaged him and received no reply)
I looked at a lot of pegs, floorboards and hardware made for other bikes to explore how they might be modified for the ST1100. I even bought a set of Kuryukan pegs and pivoting clamps. Nothing worked.
As of October 2018, I have come to the conclusion that
@PhotoDoctor's concept is almost ideal.
His selection of pegs is what I concluded is best. I ordered a set. They match the ST1100 in terms of color and styling. They're inexpensive. They lend themselves to customization.
For my height (69 inches), the positioning needs to be lower to be able to comfortably get my feet on the pegs, and for best ride comfort.
I made a bracket that attaches to the tip-over wing cover threaded boss. Here is how they look:
BUT, this will NOT work. The position feels great. Very comfortable and easy to find while riding -- but the mounting is not structurally sound.
I CONCLUDE:
The best mounting will be achieved by welding a bracket to hold the pegs onto the exposed 12mm diameter struts under the wings. That will move the pegs about an inch aft of where they attach in the photos. The bracket will include a though hole allowing the pegs to be bolted on. With this geometry (using these pegs) there is sufficient ground clearance that the pegs can be fixed, although adding a retraction spring is straightforward.
That approach has the following benefits:
It's inexpensive.
It requires no cutting or modification of the wing covers -- and those things are nearly impossible to buy
It is structurally sound.
Cosmetically better.
Places the pegs in a more comfortable riding and finding position.
Allows the pegs to be cheaply removed/replaced
The downsides:
Requires welding.
I even ordered a split collar clamp to see if the welding could be avoided, but alas Honda made every angle of the strut at a weird angle so the pegs could not be mounted parallel or at right angles to anything.
If I had the initiative, I would design a custom bracket that bolts to that strut. That's the money shot. If someone made that available, it's game, set match!
Anyway, that's the update. When I get free time, I'll find a welder/fabricator and call this one done.
Another angle...