Would at the very least be driving up to Cooktown via the Bloomfield. You're also driving straight past GRR and Mitchell Falls!

If you aren't keen on the GRR, you can get to the El Questro entrance without even leaving the tarmac.
GRR can be done in 4 days if you must rush it (including a night in El Questro for the hot spring in the morning and a gorge walk. Emma Gorge is amazing over to road too.
Add atleast 1 night in Lake Argyle too, you drive straight past it otherwise.. amazing.
Not too sure why you've got 20 days down the coast of way. I'd allow 14 MAX. We included 3 nights in Gnarloo station (base of ningaloo reef) 3 nights in Exmouth (you will lover the snorkelling off the beach but bring rashies, at the very least. You can drive from Perth to Karratha in one day (14hours) to give you an indication, and there's really only handful of stops. I'd add in Karijini too, well worth the detour. (allow 3 nights in Karijini as it's a days drive in and a early morning leave if you go from exmouth to karijini then to Port Hedland via Hamersley Gorge, past Wittenoom back to the main highway.)
Really if you end up in W.A at the right time of the year, you want to be spending a good 2 weeks between getting to Broome and leaving Lake Argyle to experience the Kimberleys.
Just the way I'd do it if and when we go again.
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