cant remember where i read it but there were some mics that can do decent hi spl below 2V, it was some brand i never heard of. also i think some church and SP mics can run on PIP with acceptable results. ive seen several recorders with PIP in the 2-3V range, which is a little low for 4063s which are relatively expensive as well
they dont need to be off-the-shelf necessarily. if resistor mods can help accomplish the same thing, they are fair game