Apparently I wasn't specific enough. I didn't mean to have 30 encrypted microSD cards, only very few have actually encrypted stuff on them, the others you could fill with music files or whatever you like.

When you travel e.g. with a digital camera, having a lot of storage cards doesn't raise eyebrows and suspicion. Carrying a lot of cards should make it a pain for the border customs folks to inspect or even copy them all. People might be lazy...

Anyway, it was just an idea. There are much simpler, non-digital ways to transport wallet recovery data safely and likely unsuspiciously through border customs.

My point is: make a list of how your valuable data could be found or inspected and try to find reasonable mitigation which isn't easy to spot and involves unsuspicious items almost every voyager carries or uses. Books, personal diaries, small phone number notebook, yadda, yadda, ...