I assume Mr Warning
a) has a Thai license with the required endorsements; and
b) is aware the PA-46 is a single pilot a/c;
Otherwise would appear a bit desperate.
Seriously, you will find customs much easier in Darwin (1000nm from Denpasar, but easy to reach from Kupang where Jet-A is available), but as for Broome (680nm from Denpasar), as long as you stick to your notified arrival time, no dramas. Either way, they will supply a can of bug spray on arrival if you don't have one. Takes a couple of minutes. Not really a problem in Apr/May, even in the top end.
You will need to arrange a temporary import permit with customs if you are scheduling maintenance while in Australia. Contact a customs agent/broker in advance, not after you arrive, or you aren't going anywhere.
