You could print copies of the original blips too of course, but the bingo chips don't require printing and cutting.
Buy some weird minis on eBay and make blips for them:
Rule: If you get shot and you lose a life point, and you could move 1 square North/South/East/West to be out of Line of Sight of the shooter, roll a die. If the result is 1 or 2, 1 lifepoint is instantly restored.
Comment: Hugging corners provides protection. So skillful tactical planning is rewarded. You can outflank your opponent so he has no place to hide.
Rule: Each Marine chapter gets 1 Overwatch token. Each Alien unit type (Grechkin, Ork, Android, Chaos, Dreadnought, not Genestealer) gets 1 overwatch token each. The miniature with the token may fire once during the turn of its enemy at any target that moves in its Line of Sight. If the target is out of sight after moving its first square, it cannot be targeted. Dreadnoughts may only fire their least effective weapon (Heavy Bolters) on Overwatch.
The token is placed beside one miniature at the end of the player turn, and removed when a miniature fires on Overwatch, or at the start of the player's turn.
Overwatch favors the defender, but also those with the most heavy weapons. If the Dreadnought got to fire all its weapons twice in one turn it would be unfair, so just the bolters.
If the above 2 rules are combined, the target of Overwatch can use the cover rule for protection.
Overwatch and the corners rule above provide a tactical puzzle in each combat turn, a bit closer to Space Hulk. So clever manoeuvre becomes as important as firepower in Space Crusade.
On the campaign, if the least successful player is 2 ranks behind the most successful, they get promoted a rank to give them a chance.