I’ve been using Miryoku for almost a year now, and I love it. The home row mods became natural surprisingly quickly. I do still need to tweak a setting somewhere; I tend to leave accidental "j"s around when I get found fast and an going for a capital on the left hand.
It seems to me that Syncthing is the exact right thing to use here; what is “overkill” about it that makes you think you should use something else?