Package a second port (gitlab-ee instead of gitlab-ce)

Dear all,

I maintain the www/gitlab-ce port and would like to make also a 
www/gitlab-ee port available.
The ee port only needs another distfile and some very small 
modifications in the FreeBSD Makefile.

Is a slave port here an option?

Or should I use another technique (maybe just include the gitlab-ce 
Makefile in the ee port and overwrite and extend some targets?)

Maybe someone has a suggestion here?

Here a short diff, it will maybe best explain what I want:
https://gitlab.fechner.net/mfechner/Gitlab/-/commit/6240f36dba538becb3482d0d3a16af2cd873bd31


Maybe it is also an option to create the following structure:
www/gitlab (holds common logic)
www/gitlab-ce (the ce edition that extends the www/gitlab Makefile)
www/gitlab-ee (the the ce port, but just the modification required for 
the ee edition)

Thanks a lot!

Gruß
Matthias

-- 

"Programming today is a race between software engineers striving to
build bigger and better idiot-proof programs, and the universe trying to
produce bigger and better idiots. So far, the universe is winning." --
Rich Cook