Your front light mount is the way to go, at least for those of us that like handlebar bags. I see that the Specialized site,
https://www.specialized.com/us/en/turbo-vado-5-0/p/171132 , still shows the stem mounted light but specs a fender-mounted light. Sounds like a mid-year change. I did look at moving the Supernova light to a fender mount some time ago, but realized that the power cable would end up entering through what would be the top of the light potentially allowing water entry. With access to a 3D printer, one of my sons volunteered to help out old dad with a new bracket that moves the light above a handlebar bag. Gotta work with what ya got I suppose.
The brake change did require a new 203mm rotor and a new adapter for the larger rotor. The adapter is a Shimano SM-MA-F203P/P. The rotor is a Shimano SM RT78 matching the original equipment on my bike. Note the "UP" arrow orientation. The heat sinks from the new 'metal' pads are also visible.
The 180mm front rotor and adapter moved directly to the rear wheel, with the adapter being mounted with the"UP" arrow pointing "DOWN" (left in the photo). This gets correct pad contact on the rotor. I'm not exactly sure why this was necessary but mounting the adapter with the 'UP' arrow pointing "UP" (right in the pic) did not get full contact. I think you can just make out the 'UP' arrow on the adapter in the photo. Note the heat sink fins to the top left of the caliper from the new 'metal' brake pads.
A simple adjustment of the new pads and off I went.
BTW - My wife and I really enjoy St Pete's, both for cycling and just hanging out.