If you run the bond wire to the niche, you need a lug for the purpose (may not be there on one made for brass pipe) and it needs to be potted. It would make this a lot closer to the letter of the code. The pool will need to be drained down to cut that pipe anyway. I am not really sure how you would mount a lug in a metal niche. Sheet metal screws are out and it needs to be water tight.
