whereas the IFR aircraft is not giving a position report in the first place, meaning their location is not known to VFR pilots.
Climb and descent calls are made by IFR. No need for position reports as all aircraft are in level flight at their quadrantal oops hemi levels. If VFR are will be in conflict with a climbing or descending IFR, they pipe up. Of course they (the VFR) will know what frequency the IFR is on because it's published ON THE CHART.
The only thing that will happen here, Dick, is that VFR will
also have to call climbing and descending, which doesn't sound like a bad idea to me. Be careful what you wish for.
I am sure you also understand that there is no mandate for a transponder for VFR aircraft in Class G uncontrolled airspace
There is above 10k.