Is there any way to get Drone tokens other than taking a Borg captain?
The "Borg Alliance" Elite Talent that comes with the Avatar of Tomed gives you 4 Drone Tokens. However, you can't take it on the Borgified version of the ship. You can take it on another ship because it also grants a Borg Upgrade slot, though.
If using the upgrade is an action, Borg Queen 7's Action/Fleet Action will let you do so and reduce the drone cost by one. Alternatively, Magnus Hansen can be discarded for a single drone token; you can pair him with Goval for another one.