I guess it all depends on the definition of the Kris in each of the two countries
these are the rules used by Parcel Force to ship to the US
https://www.parcelforce.com/help-and...d-restrictions
“..Weapons Weapons (including Section 5 firearms, CS gas and pepper sprays, flick knives, and other knives that are banned knives under UK laws, tasers and stun guns)....”
Is a Kris a “ weapon” banned in the UK and US?
This would be essential. I recently sent, via the post to the UK a blade to someone it was traveling with a shield and described in the custom declaration as kris. It went without any problems.
I regularly see blades being offered on line from the US available also in Europe , so it has to be possible.