> Note: I haven't tested this, but hopefully it should give an idea :-)

Perfect!
You reminded about services and there is an idea even easier: just remove
colord-service.
How? This issue has already been discussed in *"Deleting services from
%desktop-services in operating system declaration"*
thread.

How much I understand, it will give the same effect?
I just do not work with physical documents, and so I absolutely don't need
either scanning or printing. And I would be glad
to completely get rid of Samba, CUPS and Sane in my system =)