Just to clarify the rules, the only way you can withdraw your subamendment and propose another subamendment is with the unanimous consent of the committee.
Alternatively, I can call the question on the subamendment. If it's defeated, you can move another subamendment. Why don't we proceed in the second fashion rather than the first?
Seeing no further debate on your subamendment, we'll call the question.
(Subamendment negatived)
If you wish, you can move your other subamendment. You've just read it into the record, so you don't need to repeat it.