The Cape to Cape in WA or sections of the Bibulmun; both have active Friends who publish information about acccomodation, transfers etc, and both have commercial groups doing bits of it.
Look in the back pages of Great Walks (most big newsagents) - lots of adverts for providers of 'pack free' or supported walks - Park Treks, Inspiration Outdoors whcih is excellent for WA
The Great ocean walk has lots of providers, its an easy walk, and not at all difficult to start and end each day at accomodation or at least with shuttle.
Agree bits of the Great North - after all, you needn't do all of it. How about say, the start to the Hawkesbury?
What about the long coast walk in Sydney, starting Barrenjoey or North Beaches and ending Cronulla. Similarly Adelaide has a contiguous coastal trail now from at least Aldinga to North Haven. While we are in SA, agree bits of Lavender, the Reisling trail or better the new
https://cvwwt.com.au/ clare Valley wine and wilderness trails which are DEFINITELY planned to go from accomodation or winery to the next! The Adelaide 100 is similarly designed to be inn to inn. Yurebilla (3 days around Adelaide) can be, might need a bit of help from public transport.
The KI wildnerness trail has a well organised shuttle at the Western KI caravan park; thee's cabin accomodation and they do daily pickups. There is a group also running the "southern ocean" I think its called on the other side of the passage- basically the first few days of the Heysen, along the bottom of the Fleurieu. Also, there is a shuttle service in the souther Fleurieu.
Yes, I'm a fan of the supported walk!