Howdy Chris. Those are good questions.
The “specifically for this jam” clause is meant to prevent pre-existing adventures from being submitted. Submissions that are made for this jam in addition to other jams happening at the same time are allowed. You’re perfectly fine to submit Snag the Suit/Evac the Exec to both jams.
As for the “essential images” clause, it was added as a counter-measure to people trying to circumvent the word limit. However, it has the unintended side-effect of barring any icon-heavy scenarios (such as yours). In response, I’m going to revise that rule so your adventure is allowed.
Ultimately: you’re fine to submit Snag the Suit/Evac the Exec. Thanks for taking the time to make an adventure, and ask me those questions.