Bring a dog with you on your flight and hide the seeds up the dog's ass. Then if the drug dog smells it everybody will just think it's frisky.

But the coffee bean idea is less disgusting/inhumane.

Perhaps the dumbest drug-smuggling idea I have heard of was some dude I saw on TV who had a brick of coke surgically implanted into his leg for a flight, and as if that wasn't bad enough for him he got caught. So don't try to surgically implant the seeds into yourself.