Si:
If you promise to always dummy copies of your documents, and NOT the real
ones, you can get closer to a "simple" way to do this using the master
document feature of Word.
Most experienced users will tell you NOT to use master documents, because
they can easily corrupt your subdocuments. BUT if you create a master
document from copies of your good stuff, and create it with no expectations
of maintaining it in that form, you should be okay.
(If you have to change something, change your good documents, make more
dummy copies, and create a new master document all over again.)
In master document view, when you insert a subdocument, Word will
automatically add the required section breaks. It will also handle your other
problem -- fonts etc. Word will notify you that the subdocument contains
styles with the same names as the master document and ask you if you want to
rename the style in the subdocument. Answer Yes to All and the subdocument
styles will be renamed, and thus the appearance of the subdocument will not
change.
Bear