If you have level 3 artillery range you presumably have a decent level of mining productivity tech. So replacing the PMs in the drills with EMs should knock only a few percentage points off your ore output. And it's not like you are short of unexploited ore patches to make up the difference.
Do I gather correctly from the picture that you are running solar power, not nuclear? If so, that means that the total cost of using PMs in mining drills is huge. That cost includes the pollution generated in making all those panels, and the ammo expended in dealing with the consequences of that pollution.
For me, 'fun gameplay' mostly consists in finding the most cost-effective way for the factory to grow. If you choose to maximise production regardless of cost, I think you have limited grounds for complaint when the bill is presented.