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I have a dia compe one that come with a clamp on front brake, let me find the model.
here it is:
http://www.diacompe.com.tw/product/track-brake-set-for-front/I remember seeing you can actually get a set of the levers only, I'll give it a search and see what I can find, can understand why because it's much easier to just ride in the drop rather than going up and down with the crosstop levers.
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@Dammit found it! here you go, Dia Compe 131 Road Brake Levers;
https://www.velovitality.co.uk/collections/brake-levers/products/dia-compe-131-road-brake-levers
My advice is to replace the screw bolt with an allen key bolt which make removing/installing a breeze at Herne Hill.
Road levers are going to be a 23.8mm clamp though - 2.2mm too small, plus the curved shape would be sub-optimal. I may be looking for something that simply doesn't exist.