I agree with most of your advice. Here are my different opinions.
Impact foam may be underestimated. It doesn't need reaction. And it provide +2AC circumstance. Spellcasters such like Bard can initiate it by a movement to fall. And Bard doesn't use attack rolls. The side effect can be ignored.
Magus is a nice choice of dedication providing cantrips and focus spells. Dimensional assault: you can use one action to choose a perfect place for a strike and Explode. It just need Verbal. So no AoOs!