question 4: With the 1 out of 2 multi sig setup, can I put some small funds on addresses related to the seed in single sig setup, so the attacker would think he got bait, but in fact he only gained access to the small funds and not the full fund?
Please, do it, but pray that if they try to compromise your wallets, they 'll do it without you being there.
It's such a violent act, being tied up in a room, forced to reveal your wallets. (see here for incidents like this:
https://github.com/jlopp/physical-bitcoin-attacks/blob/master/README.md)
Unfortunately, the attackers that know what bitcoin wallets are, are not ignorant anymore.
They 'll know your trick, they 'll be prepared for it.