This seem to be a very complicated solution for such a
simple problem.
First. Shame on you if you are connecting all your users to
the internet with internet routable addresses; they should
be behind a firewall or router capable of using PAT. ALL
users should have private address space.
If you need more that 254 address on a single physical
network; use subnet masking.
Example - The pool address of 192.168.0.0 /22 will
provide 506 or so addresses. Move that mask to /22 and
you have over a thousand addresses. Not that I would ever
recommend putting a thousand users on a single
unrouted segment.... but you could!
Did I miss something on the original questaion?