Avanti has recently been bought by Scott, and the brand seems to be on a development hiatus at the moment - they haven't released a new bike since last year, only carried over existing models. I have a hunch the Avantis are designed by a couple of guys in NZ, and made by a custom carbon manufacturer also in NZ. That worked well while the national team was on the brand's bikes, but now it's been bought by a Swiss company with no real history in track racing, and probably no interest in building cutting edge bikes for the NZ track team, it's hard to see how Scott Avanti would tender for the job.
Would it be worth adding Koga to the list? They have a new model coming out, and didn't they use badged BT bikes for a while as well?