I don't think if it is possible. The whole point of an offline wallet is that it has no Internet connection. Electrum is a lightweight wallet so it doesn't synchronise fully with the blockchain but connects to the other nodes. Create a watch-only wallet on an online computer, it will be much easier and more secure. I wrote a tutorial on that some time ago.
https://bitcointalksearch.org/topic/m.37162163
Topic: manually adding transactions on electrum - page 2. (Read 326 times)
I have a wallet I created with Electrum on a device that has never connected to the internet. I have sent bitcoin to an address in the wallet, but obviously the transaction does not show up. Is there anyway I can add a transaction to the wallet other than using the internet? For example, I have the tx file that I created with electrum (The bitcoin I sent to the new wallet was on another Electrum wallet). Can I somehow add that to the wallet's tx history?
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