Don't know enough to truly answer the question, but..

IF the entire database (all objects) is identical in structure, and IF all the tables are fully published, then you could:

1) kick everyone off

2) remove replication

3)

either

a) backup both databases

restore the databases as the other (i.e. swap names and locations)

setup replication as it was

or

b) point all updating applications/users at old subscriber

point read-only stuff at old publisher

setup reversed replication, i.e. old subscriber is now publisher

4) let everyone on again