For TTāers the fabulous Modolo Kronos Caliper weāre great with the main flaw of wouldnāt stop you in the wet & pretty poor in the dry but then TTās were not about braking
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https://www.iancammish.co.uk/modolo-kronos-cxde
Love a Jubilee, especially a drillium one (which is slightly heavier!). But a Walter edges it for the weight weenie title -Huret Jubilee. Probably the lightest and weirdest derailleur ever envisaged.
I had a clubmate once who always came out in wellies in the winter.I bought a bike with the clip in Merckx pedals on it. The guy (a farmer) only used them with Welly boots. Having attempted unsuccessful clip in/out, I could see why the choice of footwear, was choice...