Hmm, that's an interesting one.
They'd basically not be able to grow your population until you can capture pop with other planets, so you'd have to send colonizers with 0.1 pop to each planet.
If you take Pioneering for a bit of pop and later the 5 loaded transports you're over 20bilion - technically enough to hold 200 worlds. For the rest, you'd have to capture worlds (idealy via culture flipping, but invasions work too) and make use of that population.
Bear in mind that hives only produce flat manufacturing, and not research, so your research is going to be limited by that population. You'd probably have to tech trade to keep pace with other empires.