Have you considered the Willaims ramped foresights?
The come in differeing widths and heights and either screw on or sweat on types. It was the Willaims ramps that Parker-hale used on their rifles and the later BSA ones like the CF2 also used Williams foresights. Plenty of range in blade heights an bead size too. ................ Just a thought.
-------------------- Don't let the bastards grind you down!