To make this a bit easier to discuss and know where the conversation should be directed, here is a basic way of categorising the main bending techniques we know so far.
High Level Technique
Water – Bloodbending
Fire – Lightning Generation
Earth – Metalbending
Airbending – Flight
Water – Bloodbending without the full moon/Psychic Bloodbending
Fire – Combustion Bending
Earth – Lavabending
Airbending – Unknown
Spiritual Bending abilities
Water – Spiritbending
Fire – Energy/Chi/Chi Path Analysis
Earth – Potentially Toph’s near worldwide scale seismic sense (Using the Banyan Tree to spiritually enhance her seismic sense to “see” people nowhere near her)
Air – JInora’s Astral/Spirit projection
For these 3 categories the only ones not confirmed really are if Toph’s seismic sense in the swamp is the spiritual technique for Earth and we have no idea what the rare/bloodline ability is for Airbending.
My idea is that for air it is soundbending as some airbending techniques already involve stuff like sending a large amount of air through a bison whistle or something like that. So I could definitely see a super powerful rare ability of someone able to basically make sonic booms and crazy loud or high pitched sounds.
As for your idea of bending to enhance or make up for the loss of a sense. Earth would be covered already, Waterbending to some extent is with Ming Hua using water as her arms.
Going with the air sound connection I can potentially see some sort of thing where airbending can make up for the loss of hearing, though we already know they shave their heads so they can feel the air flow change of incoming attacks so that would also make up for sight or hearing in some cases.
Fire I can definitely see some form of heat map style sensing, so even a blind firebender can sense someone is nearby due to bodyheat.