I've done something similar, wearing my Airpod Pros under the Sony WH1000XM3 headphones with active noise cancellation enabled on both. This worked really well on the BART train system in the Bay Area, blocking out nearly all of the noise except when going through the tunnel under the Bay (that section measures more than 85 DB on my iPhone app). There's a bit of wonkiness when the external noise changes suddenly, like when passing another train at speed, but overall it's much better than either the Airpod Pros or the WH1000XM3 alone.