There’s always the peanut gallery... They don’t realise that all of the fosters and shelters are pretty much at capacity right now. You’re doing a good thing doing as much as you can right now.
Happy to try and rustle up some resources for you if you’d like that? I know there are low cost options for desexing and vet care, pet food pantries/food parcels, and bulk buy foods that work out cheaper
Edit: National desexing month is coming up in July so hopefully that expands your choices https://ndn.org.au/low-cost-desexing/
Edit 2: Argh, there’s apparently legalities regarding having to be the owner… but there’s currently one council doing free targeted desexing and rehoming of semi-owned cats. Perhaps this is a good avenue to look into https://www.petrescue.com.au/library/articles/free-cat-desexing-a-win-for-cats-councils-and-communities#targeted%20desexing
Edit 3: This list of councils that got grants is from 2024 so maybe check if yours is on there and ring up to check with them if it isn’t https://agriculture.vic.gov.au/livestock-and-animals/animal-welfare-victoria/cats/cat-management-initiatives/targeted-cat-desexing-program.
For good measure https://aussie.zone/post/30951352
And Give A Kitty A Home could help with desexing and homes too https://gakah.org.au/our-programs