I recently listened to a presentation by Cory Stevens about his methods to keep caged virgin queens alive in incubators until introduction into week plus queenless nucs. He claims a high survival rate and acceptance. The theory behind the process makes sense. Here is a 2019 blog post about it. He may have youtubes also (who doesn't these days?).
"https://www.stevensbeeco.com/single-post/2019/06/09/introducin-virgin-queens"
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