*far from a "premier" caster*
The setup will more than likely be fairly awkward and will lack the proper balance. In my opinion it would be far better if you learned to cast the right way with a balanced setup.
Other disadvantages could be the excess backing capacity,because any more than 100 yards is more than overkill for whatever you'd expect to hook on a five weight. I have never used that model and I'm not to certain about the drag system which might not be light enough for the more delicate application that a five weight would typically be used for.
The bottom line is that you could use if you want to, but it could be hazardous to your ability to adapt to using other rods or even learning to cast proficiently.