If it were me, I would knock up a concept of what I wanted using some aluminium channel.
Or if you know how to use a Computer Aided Drawing (CAD) program, I’d try to design something in that.
But you are right. Without the sight base, there isn’t much you can do.
I haven’t looked, but I wonder if there is some steel channel or hollow section that is near enough, which you could then cut and file to suit.
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