Like is not possible to install on the frame the typical bontrager duotrap sensor, what kind of cadence sensor do you equip? Please could you add some pictures and main spec?
Bike of that caliber most would have power which has that included id say. If going old school tech for cadence etc I think garmin still do one ? Used to be a gsc10 or something before they updated to make it go on the hub.
As mentioned, I suspect most people will have power from pedals, cranks or spider that gives cadence. However, Garmin do a magnetless cadence (and hub speed) that would work for you.
Garmin Cadence Sensor 2 | Bike
ETA: May want to just check the clearance between crank and chainstay. My SC is still on it’s way, but noting people fit powermeter cranks with ‘pods’ on there I am assume the cadence sensor *should *fit. 9mm is what you need.