It has potential - in particular I'm imagining May's reaction to having Faye do "better than OEM" repairs, or giving her a substantially remodeled custom face that she likes better.
But, honestly, if Faye just plain does a good job, she'll appreciate it. For all her flaws, cynicism, and impulse control issues, May is someone who has major loyalty and gratitude for people who do something nice for her, especially when it's something they didn't have to do and when it's somebody she's been an ass to earlier.
But on some level it's still going to be disappointing, at least to me. I really wanted to see Chibi!May inhabiting Momo's old chassis and asserting her own identity in it.