Thank you for the update, indeed my question came from reading the cat command file manual where it clearly states that concatenation works only with a limited number of commands . Will be useful to update the manual specifying that concatenation works for all commands.
Curious if you have tried it as it has been there for a good long time. As an example for my IC-7300 setup I use a multitude of concatenated commands:
AntennaTuner=FEFE94E01C0102FD
VarACStartCmd=FEFE94E0164000FD,FEFE94E0164501FD,FEFE94E0161201FD,FEFE94E01A05006703FD,FEFE94E01A0500600128FD,FEFE94E027140000FD,FEFE94E02715000050000000FD,FEFE94E01A0500650090FD
VarACExitCmd=
Read the cat command file header to see how you can do it. This feature already exists. Archiving request.