I think it's a fine idea. My main with 123 wpf in one weapon is enough with medium armor, so as not to lower the effective proficiency to below 100, so having that much for two classes you enjoy playing should be awesome for you. I've been thinking about doing this myself lately, for when I stop retiring, trying to figure out what that build might be like. From what I understand wpf doesn't really make a very huge difference, unless you're really going high with it with an agi build, then you'll probably notice the difference compared to a more minimum amount.