Avoiding inpatient after attempt in Australia?

I’m planning on overdosing this week but I’m scared of what will happen if I fail - I’m in Australia, is it possible to avoid inpatient psychiatric treatment after a suicide attempt? I’m planning on doing it at a very specific time when my housemate is away so I don’t traumatise them. If I fail I won’t be attempting again until there is another similar opportunity which will be at least six months away so I won’t be at immediate risk of reattempting. Inpatient is my worst nightmare but I don’t want to do this anymore