Is there any way to remove unlock_time for a sent transaction?
Yes. You need overwrite the transaction with another transaction sans unlock_time. If the transaction in question is already in a block, then you'll need to reorganize the blockchain to the depth where this transaction was first added, removing it and adding your replacement.
The short version: "no". This is part of the immutability property of blockchains (unless you are ETH).
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1So really the second way to do it is to convince a majority of miners and nodes that they're Doing the Right Thing and Thinking of the Children by ignoring the unlock time on your transaction. – user253751 Sep 28 '16 at 3:03
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My future children will probably be happy if I lock up some monero for them. Good to know I have to be real careful playing around with the unlock_time :) – Oyvkva Sep 28 '16 at 7:13
