Popz
Its too late to think about this for this year now but if I only had one colony and wanted to to make an increase I would use a Snelgrove board
The reason is that you can do it as soon as you have flying drones available.
You don't weaken the colony so you still will have a good chance of honey
If it does go wrong and your new queen is lost or fails to mate you still can just move some eggs above the board to try again
If you don't fancy doing that or your new queen has problems that you can just recombine the boxes and you will still have bees
Snelgrove's little book about swarming is the best available giving all the options not just using his board.