- take Risk Starcraft or Starcraft Boargame minis
https://boardgamegeek.com/boardgame/22827/starcraft-board-game &
https://boardgamegeek.com/boardgame/131261/risk-starcraft-collectors-edition
- use Memoir'44 rules & Card
https://boardgamegeek.com/boardgame/10630/memoir-44
- add few Star Trek (large) battleship as Artillery & Star Wars Armada (small fighters squadron), Starcraft Boargame (as Risk has no ship) or Silent Death ships as plane
https://boardgamegeek.com/boardgame/139771/star-trek-attack-wing &
https://boardgamegeek.com/boardgame/163745/star-wars-armada or
https://boardgamegeek.com/boardgame/3895/silent-death
you get a very fast boardgame looking like Blood Angels VS Ultramarine in a scale between W40k & Epic
LOL
I gave the battleship 3 hits points and possibility to shot with a single dice at 1 hex range when moving, so that, when it was advancing, it was quite the same like a Norad class battlecruiser coming into the range of its Yamato Cannon.
I supposed Star Wars: Rebellions or Epic
40K minis could be used the same way when you are missing time for a full game.