Griffo,
And from memory. I think you'll find that the B050 rule applied to NOSAR, not SARTIME, flights for excursions less than 50nm.
Yes, the ageing memory can play tricks, but I am pretty certain on the above.
SARTIME was never restricted by altitude. It was common practice for PICs of 'charters' to plan with a SARTIME coming out of places like Kakadu, and transit was normally in the A060 to A090 range.