Went through Long Plain on Sunday, rode up every track except the Blue Waterhole one. They are all in good condition, can't see why you couldn't.
Broken Cart past the junction with Boundary road was fun. Lots of bog holes. Plenty of timber down on track. It joins back onto Barnetts, kind of shortcuts if you're heading towards the end of Wee Jasper road. Slow going in the bog holes with a pillion.
Creeks all have plenty of water.
I want to do Blue Water holes this coming weekend, and maybe a loop through Tantangara to have a look and map out some tracks.
I'll let you know.