You may be over-thinking this and then over engineering the range.
When a bullet hits a steel trap it fragments, putting out clouds of lead dust. This dust contaminates the range and after awhile migrates everywhere. If shooters have to walk down range to post and retrieve targets, they kick up clouds of this lead dust.
If you have paid staff, they are subject to workplace standards, which are much higher than for a club range.
What you want is a range compatible with any kind of cheap lead ammo that does not put lead fumes in to the lungs or lead dust on the clothes of the shooter. That is, the shooter is "lead free" - not the range.
I have designed and installed such ranges.
3 important components: Air handling - target retrieval system and bullet trap.
Air handling. You need an air wall generating a gentle laminar flow of air across the shooting area and past the shooter. The airflow must be SLOW, so there are no eddies. many ranges use fast air, which causes eddies and brings muzzle gasses back onto the shooters. Air should be around 50 fpm. The shooting bench should be as open as possible, to minimize eddies.
Target retrieval. This keeps shooters out of a dirty area.
Trap. The Savage Snail trap has a steel catch plate at 15 degrees. The bullet hits the plate and then skids up the plate into a swirl chamber (the "Snail"). There is a gentle waterflow down the steel, so the bullets hydroplane and do not generate any lead dust or particles at all.
This costs a bit more to build than a smash plate range, but the maintenance and air handling costs are much lower.
The fact that any ammo is welcome makes it more commercially attractive.