“The most disappointing example of this was when the Queensland government recently invested in [630 diesel buses]. Just when Australia is running out of diesel, these chaps are accelerating the problem. (https://www.smh.com.au/national/queensland/back-to-diesel-lnp-dumps-queensland-s-electric-bus-program-20260901-p60tg4.html).
Have you looked at the hydrogen (fuel cell) buses. We have a handful on trial down here on Hobart. They are rated up to 400km of a full tank and it only takes 15 minutes to gas them up. The fuel cell itself is quite lightweight and so overall the vehicle can be lighter. Biggest obstacle seems to be the refueling infrastructure needing to be built out.