Oh man. I imagine if he tried right now, he wouldn't get very far. Spiria Links are always kind of a battle of wills, and he'd probably have not only Otto trying to push back against him, he'd also have the tentacles to evict him. It'd be a two against one battle.

I think in order for him to have a shot at it, he'd need to first earn the real Otto's trust; even if he doesn't show it on the outside, if his inner self trusts him then Otto'd be able to try and prevent the tentacles from trying to kick Kor out.