Sounds interesting. On ATR, every time flight controls anti-icing is turned on, stickshaker activation AoA goes down (if I recall correctly, it's from 12.5 to 7.5° AoA) and higher approach speeds have to be used. However, if conditions during approach are not conductive to icing and aircraft is visually confirmed to be free of ice accretion, icing AoA could be reset and normal approach speeds used.
Are you sure that system on E-jets can't be reset inflight?