swapping the dish on top to the winguard t4,motion

Just because someone is not a fan of something does not mean that it's not something that will work for you. The in-motion units these days work Very Well! Even if you don't use them while driving, you can turn them on and use them to ensure where you park will have a clear view. There are "some" advantages to domes and many disadvantages but it's up to you to weigh both of these.