Sorry to join in this after the first round.

I would say that going in person would be most unwise with denmark still a considerable threat. Therefore it would be best to stay. I'd say option B with sending Maximillian would be best. It would give poland a sense of importance and perhaps help bolster them a bit.

Secondly I'd go option B in Incorporating them. If you go overboard it may cost you too much. If you don't help enough they feel disenfranchised and not be so helpful later on. So once again the middle route appears to be the best.