Queen cage for varroa control

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CBPV is a virus of adult bees, but the window for infection is short, something like the first 24hrs after emergence. So introduce a brood break; if there are no bees less than 24hrs old then it can't spread. Once all the bees infected with CBPV have died off, brood rearing can resume. Problem solved.
 
so wait say 25/26 days for last drone brood to emerge. Let the queen out to start laying up again and first eggs will emerge say a further 20 days later. That's a lot of bees to loose from a stressed colony with a high mortality rate. The open floor method discussed here https://beekeepingforum.co.uk/threads/a-way-to-combat-cbpv.51048/ sounds like a better way to work with the bees?
 
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