I think iron man and guardians are pretty bad choices to compliment SW in a small collection. They are both two flipper fan layouts with speed and flow and space/tech themes. They can both be brutal with very short ball times. The theme/theme integration and assets in AIQ is so bad that to me it’s a non starter.
I also have a small collection and sw premium, and so far I’ve chosen GnR (SE) and Deadpool (pro) as compliments. Iron Maiden pro will probably be my 4th game, though I am considering a stranger things and tnmt.
SW is an incredible game and I think you will find that it will spoil you in the future. In terms of assets and theme integration there are very few comps. Things like the Death Star being rarely seen are actually great features that motivate you to come back for more (seeing any toy over and over gets old). Yes R2 and Han are good but 99% of other games don’t even give you a choice of character, SW offers much more path variety than most games. Lastly, the multiplier feature on SW actually creates a ton of depth and longevity. You can create your own mini games with it like trying to get the biggest video mode or hyperspace shot scores.
Back to Deadpool, have you considered it? I think you’ll find that it will check every box.