If we would see any syncretism of swords it'd be between sabres and katana, which are both single edged blades.So, a thought occurred. With the continued Japanese-Western syncretism in the arts and culture, what is the possibilities of a fusion between European-style fencing (Most likely French) and Japanese Kenjutsu? Yes, I know the smallsword/rapier/foil/sabre and Katana are completely different swords, but I'm wondering if that style of sword would become more a niche for certain Samurai in Japan. Someone makes a mix between Japanese swords and European smallsword (Japanese blade + European guards) or for this specific syncretism, the reemergence of Japanese straight swords to fit the European fencing style.
Also, I'm wondering for music, and if instruments like the Piano later in the 18th century will become popular in Japan
Maybe we could see a Japanese style focused on one handed snipes to catch your opponent off-guard.