ISO = rubbing alcohol (not denatured (green or blue)), 1 part ISO to 8 or 9 parts water (I have went 50/50 without issue)
I grow outside and when I purchase predatory bugs they go outside as well. I have read that some will put lady bugs in their tent, I would expect that some loss would happen. My first batch of ladies were for aphids, I was run over with them the grape leaves and tips were completely black with them.
No I would not spray that stuff (some folks are allergic to rosemary) on my buds.
As for WPM or any other mold/mildew I use scissors and cut it out, none so far this year.