Thanks but im too paranoid to use a website for that, even if you are just entering public addresses, you are entering them in batches and in some site with javaascript... I would really like to keep everything done within the wallet. I don't see why this wouldn't be possible. When you do something in the GUI, it should be possible to get the result of the actions you did on the GUI in raw format... I just need to know how to, after you build the tx with Coin Control, you import it in raw format, sign it, and broadcast it, all without leaving Core.
Fair enough... So, essentially you're wanting the "preview"/"export" functionality from Electrum... but in Bitcoin Core.
As achow101 has mentioned, there isn't any way of achieving that in the GUI at the present time... hopefully that PSBT stuff gets brought to the GUI in the not to distant future... that looks like pretty much exactly what you're after.
Until that happens, you'd either have to use the RPC calls (which would still be quite labour intensive) or use an airgapped setup with Electrum which would also cater for your desired workflow.