The simple answer is yes. Take an equal amount of each, mix together, and you will have a diluted flavor and diluted nicotine. Equal amounts of each will cut your nicotine to 13 mg/ml. I would expect the flavor to diminish - but not necessarily so much as to make it distasteful.
Now, determine whether you need your nicotine to be in a base of pg, vg, or a combination of both. The composition of the existing
ejuice will suggest that.
You could also order 48 mg/ml nic base and mix equal amounts of each to get 24 mg/ml results.