Very helpfull example. I exemined your way of solving problem and came up to this solution:

"""
Application router decoretor.

Use this to append or get rout list for specific modules.
"""

from functools import wraps

ROUTES = dict()


def bluprint_add_routes(blueprint, routes):
    """Assign url route function configuration to given blueprint."""
    for route in routes:
        blueprint.add_url_rule(
            route['rule'],
            endpoint=route.get('endpoint', None),
            view_func=route['view_func'],
            **route.get('options', {}))


def get_routes(module):
    """Filter routes by given module name."""
    if module in ROUTES.keys():
        return list(ROUTES[module])
    else:
        return ()


def application_route(rule, **kargs):
    """Decorator function that collects application routes."""
    def wrapper(funcion):  # pylint: disable=missing-docstring

        if funcion.__module__ not in ROUTES.keys():
            ROUTES[funcion.__module__] = []

        ROUTES[funcion.__module__].append(dict(
            rule=rule,
            view_func=funcion,
            options=kargs,
        ))

        @wraps(funcion)
        def wrapped(*args, **kwargs):  # pylint: disable=missing-docstring
            return funcion(*args, **kwargs)
        return wrapped
    return wrapper
So you can do smth like this:

"""
Public module.

Handles requests for unathorised users.
"""

from flask import Blueprint
from app.utils.route import bluprint_add_routes
from app.public.pages import ROUTES as PAGE_ROUTES
from app.public.contact_us import ROUTES as CONTACT_US_ROUTES

BLUEPRINT = Blueprint('public', __name__,
                      template_folder='../templates/public')

bluprint_add_routes(BLUEPRINT, PAGE_ROUTES + CONTACT_US_ROUTES)
"""Public pages for unathorised users."""

from flask import render_template
from app.utils.route import application_route, get_routes


@application_route("/")
def home():
    """Show main landing page."""
    return render_template('home.jade', page=None)


@application_route("/<slug>")
def page(slug):
    """Show custom public page."""
    return render_template('page.jade', page=None)

ROUTES = get_routes("app.public.pages")