For the premise of this scenario. The "spy ring" that would be using it would be americans, their allies, and isreali's. So it would be native english speakers, the romance languages and some speakers of Hebrew.
Here are the ideas I've brainstormed so far; my apologies, again i just picked up The Language Construction Kit again for the first time in a few years, so i may not be using the right terms:
- I realize that the first requirement to make a "secret" auxlang would be to...not post the grammar and lexicon online for anyone to read and be able to translate stuff with, but since this isn't for real and I want feedback so we'll just ignore the first
- A phonology that isn't too funky, more addition by subtraction and maybe some added sounds but no clicks or anything like that.
- A sentence order other than SVO, as I've been thinking this out, OSV has been catching my eye. Again this is just brainstorming stage
- Conjugations of verbs like spanish so the ending, rather than separate words denotes person and tense
- More grammatical tenses, like non-past, non-future. Like a teacher asking a parent or a groupmate "has johnny been doing his work?" and the
answer "Johnny is (he wasn't) doing his work."
- Nothing too crazy for an alphabet, maybe just stick with a Romanization of the sounds, or base it off a similar enough alphabet, like base it off the Cyrillic alphabet
- For genders, maybe instead of masculine and feminine, i do it by whether the thing is organic, inorganic and the third would be for non-phisycal things like the word for "word" would be this "gender."