Glad to hear you had a great time Marc!!
Can't wait to see the trip report and photos bud!
FYI :
I have recently flown from GB to mainland Europe and back again ....
on my belt I carried a altoids tin , full of charcloth and amadou (left the Chaga out as it looks a bit too much like pot)
as well as a sharp flint stone and an oval steel striker inside the tin.
Nobody in security even questioned it .
It passed straight through .
A friend, intentionally flew with a full size ferro rod in her hand luggage , with no problems at all either. Just to try it out and that went straight through as well .
I think concealed items raise suspicion , if you keep them in plain sight there should be no worries.