Re: splitting and adding new queens using a fume board and excluder
You do not need to find the queen, you just have to find where she is not. Take the cover off and give them a puff, wait a minute and she is probably down. By the time you shake and set aside brood frames she will be. Set an empty aside for handling. Then move brood frames above an excluder into what will be your top box. Young bees take queens better and don't fly back. (What squarepeg and Sak said. Harder upfront but less on install queen day. With SQP method at least make sure brood is in top and bottom. )
With 3 doubles it is time to get comfortable in a cloud of bees.
It is hard to design a safety net that some will not use as a hammock.