I would not mind doing that but I am still waiting for NRMA to tell me whether I still would be insured if an accessory was deleting that function. My first question was whether I am insured while driving with this function off. If yes then I cannot see why the accessory could not be fitted.
That is something you should check for yourself to be comfortable but things like lane assist are not mandatory ADR compliance items so there should be no reason why you can't disable it. Would be no difference to removing front or rear parking sensors or your radio for example, they are all accessory items.