On top of having the custom register added to the interface (register's LClass defined for a specific module in Startup).. interface languages matter as well.
Make sure to add the custom register also under:
SetLangMode(LangEnglish,"ENG",0);
Is it possible to use the parameter --skip-register-on-import with multiple registers, either by using a comma-separated string or by specifying this parameter multiple times in parameters.txt?
Thi...