Safety of wallet setup I just set up my Electrum wallet using live instance of Tails Linux distribution. I've written down the seed on the paper (and I remember it as well) and restarted laptop.  I plan to do all Bitcoin transactions only via Tails so I plan to recreate the wallet every time I am using it and then wipe everything out with no trace on the computer. 

There is just one thing I don't get, can I have any "static" address tied to my private key and seed or do I have to get it through creating wallet every time? Because I would like to send some coins to my wallet without booting to live distro and generating the wallet again (therefore I need to have and store address somewhere), is this possible? Thanks a lot for explanation.

And is this approach reasonably secure (or even possible)?
Your approach sounds secure.

You can use any addresses generated from your deterministic wallet to receive BTC without the need to boot up and recover your wallet first.

For privacy reasons you should generate multiple addresses from your HD wallet and one use each for receiving payments once. As long as you have your mnemonic seed you will be able to recover your wallet and all of its addresses at any time.