This is incorrect. The CDC recommends BSL-2 for routine diagnostics and BSL-3 for isolating the virus in cell culture. (https://www.cdc.gov/coronavirus/2019-nCoV/lab/lab-biosafety-...)

At the moment, most tests are certainly being done in less than BSL4, there aren't that many of them.

https://www.liquisearch.com/biosafety_level/list_of_bsl-4_fa...

You don't need live viruses for testing. You only need some viral RNA material so you can inactivate the virus by heating the samples to a certain temperature for example. Hazardous work for sure.

So your plan is to greatly reduce testing capacity?