FontForge supports scriptable modification of features using commands GenerateFeatureFile() and MergeFeature() (briefly covered in The Terrible Secret of OpenType Glyph Substitution - Ansuz - mskala's home page). I was only aware of this after making the .ttx based implementation, but it could potentially have avoided messing with .ttx files.
VS15/16 check now considers emoji bases properly. #9679
，更多细节参见新收录的资料
（七）在海上或者与海相通的可航水域救助、企图救助人命或者财产；
На шее Трампа заметили странное пятно во время выступления в Белом доме23:05
"My bum felt like it was boiling, I felt like I had a fever," she said.