It’s pretty easy to control invasions. Just don’t summon multiplayer people. You can only be invaded if you’ve summoned someone for coop and the blue cops get called extremely fast if you don’t already have two coop partners. Plus you can only ever have one invader unless you use a special item. And there are bonfires everywhere and it’s pretty easy to get to most of them with your horse. Also the invasion item is, like, crazy difficult to get unless you complete an easily missed quest that requires you to be reasonably high level.

Re: Not summoning people; there is an item you can use to summon AI allies for most boss fights and difficult areas instead of summoning players, so you can entirely skip MP and still have buddies to help you fight.

lol yeah. I did that hack to remove the anti-cheat from Elden Ring to improve performance, which also forces you to play offline, but I consider being ‘forced’ offline to be a bonus.