Yes, that would be a great system and likely what I'm about to switch both my skis too. One auto pump and one manual. In auto, the one pump is on standby and in manual, both are running all the time. I'll do mine with 500's just because they have 3/4" outlets. If you go bigger, you also have to find and fit the larger bilge outlets.
I just finished one up for a customer with dual 500's, one auto one manual but he wanted the auto pump wired direct to the battery. Not a bad way to go but the auto pump cycles every couple of minutes and would eventually drain the battery. Not a big deal if you are in the habit of disconnecting the battery when off he water but having the ability to just switch it off sure seems convenient to me.