Regarding Jefferies Track - just have a look on youtube.
https://www.youtube.com/watch?v=DcFgDLBfy8QIts pretty horrendous even in a proper 4wd.
I took a mountain bike in and ended up pushing it most of the way. The part from Jefferies Track up into the range was okay.
The bike did make for a quick trip back to the car, which I left pretty much at the start of Jefferies.
But I've also done it from Collins Cap via the fire trails on a bike as well. That is much nicer.
Mt Patrick was just a matter of hunting around for the tapes, the only tricky bit I remember was open section not far from the start where it doesn't go straight ahead, the next tape is left or right a bit... can't remember.
But it was only like 20-30 minutes each way, even if you didn't follow the route it wouldn't take that much longer.
The first time I did Charles and didn't realise about the taped route, it was getting late in the day and I didn't want to get caught out scrub bashing in the dark.