Froghunter,
Nef has an elevated brass sight they put on the newer .410 Pardners that sticks up about 1/4"-3/8". It is not a ramp but I am sure it could then be filed down to where your POI matches your POA. Give Customer service a call, they might even send you them for free since your two guns are shooting high. They will be shutting down for the Holidays soon, if they haven't already and they don't come back until about the second week of January.