Did you ever get a reply to grips for the 450 T? I carry mine daily and grips are not an issue, though the ribber has gotten hung up on clothing a few times. I am still searching for aftermarket grips.
I guess oversize is in the eyes of the beholder. I occasionally carry my 450 and it's smaller than my usual carry.
If the stickiness of the grip is an issue (BTW, welcome to the forum, Thom), bike tape might help.