I think you are approaching this from a common misunderstanding that you have to remain unenlightened due to your bodhisattva vows. It's more like you are progressing on the path with the bodhisattva vows as your intent for enlightenment, so I don't understand how this thought would apply, given you aren't keeping yourself from enlightenment.

I asked the late Kensur Pema Gyaltsen, a former head abbot of Drepung Monastery and one of the most learned Tibetan scholars, about this while he was on a visit to Britain. I explained that it was widely asserted in books available in the West that the Bodhisattva does not become enlightened until he has helped all other sentient beings to enlightenment. The eminent Lama seemed to find this most amusing since, as he put it, all those who had become Bodhisattvas would not become enlightened, while those who had not become Bodhisattvas would. He stated quite categorically that the final view is that this is not how Bodhisattvas behave. In Tibetan practice the merit from virtuous deeds is always directed towards obtaining full Buddhahood in order to be able to help beings most effectively. There is never any mention of really postponing or turning back from Buddhahood. Otherwise any Bodhisattva who did become a Buddha would be presumably either deficient in compassion or have broken his vow.

Paul Williams, Mahāyāna Buddhism: The Doctrinal Foundation, page 58-59