It can be done!
Our honey-bee colonies are pollinating 10s of thousands of plants inside an enormous glasshouse.
We chose colonies from our small cell breeding program. Specifically, because the flowers we are trying to pollinate are very small. We were surprised when we unloaded the hives how many bees had escaped through the standard size holes on the new Hive Doctor floors. All three gates of the floors were shut and still hundreds of bees got out.
Our small bees are just the right size to get into these small flowers