I have a better option....
Why does garmin not make routing in basecamp as the specific unit you choose.
For the new units you keep the profiles but if you have an older gps it needs to use those rules to calculate the route.
So you can just shape your route as you want deviate one as you want and still get the route set in basecamp.
Then the 50 via points(announced or not) is way enough even in the dense european roadnetwork gfor a days ride.
Unless of course your doing ironbut craziness, but even those will be fine for they usually use the highway anyway