If one had a setup of 2 computers, one offline as cold storage, and one online, with offline's addresses in online's wallet as watch-only, both Core clients. Could you copy the block files from the synced online node into the offline computer, then as the current coins of your wallet show up, do whatever transaction you want to do using Coin Control and whatnot, then press "send" and get the result of this action in raw tx code, then convert this code into a QR, then pass this QR into the online node's computer and broadcast it? the idea is to avoid manually crafting the tx yourself which is a recipe for disaster if you screw up. Just thinking about doing what Coin Control does manually would give anyone normal an headache. So how about doing it all on the GUI and export the tx as raw into the online node? can you type step by step how you would do this?

If this was not clear I would try to rephrase it.