Just for the sake of conversation, my '81 R65 has the same short comings that you mentioned, but my '84 LS center stand, is a 100 % improvement .
The only real difference between the two, is that on the LS the tubes that contact the pavement, are bent outwards, as opposed to the '81, where the tubes are parallel to each other, and it's amazing what a difference this makes .
So if you have access to cutters, welders and can fabricate a few thick sheet metal parts, I think you could solve the problem with a few hours of work .