Just about any magnetless sensor designed to be installed around the hub of your front wheel will work, *BUT* you do have to be wary of clearances. My Wahoo speed sensor, for example, will fit the front but not the rear of my White Industries T11 hubs.
The alternative is the magnet-based speed+cadence combo sensor that typically attaches to the rear chainstays such as this one:
https://www.amazon.com/Wahoo-Cadence...cadence+sensor