I have a ton of up-to-date info on the Halls Gap area. There are more choices than you could imagine.
Paddy Castle would be my recommendation. 20-25min drive from HG but a very short walk in. Single pitch routes from grade 7 and up.
I can send you a draft.
Closer to HG: I hear Budja Budja is good but I haven't found it yet (!).
Crock Wall is also good but a half-hour walk up Mackeys Peak to get there. There's now a new rap station there to make access easier.
I've also taken my 6yo into Point Sunshine, small bush bash but that seemed to add to the experience for her.
Agree, there's not much good stuff at the Watchtower at lower grades.