It seems like you're doing it for the right reasons, that is for yourself, and to honor your mother's family. So if it's what you want and you're willing to undergo the hassle and expense, go for it.

For better or worse we often make much of your names, but in the end it's just that... a name. You are who you are, and your ancestors where who they where. Call yourself what you like and don't worry to much about what others think.