Without Platinum/Platinum 1 on QF, I think it’s extremely hard to reliably redeem QF points on long haul in J.
Now with the QF devaluation, I think VA points are worth more than QF again. SQ and QR at least have J seats for redemption 8-11 months out if you’re organised enough. These can often be booked with VA points. The proposition is further boosted by VA having wet-leases to DOH now.
This year I managed to spend 600k VA for my wife and mother to fly to CPH return in August/September in J having booked 8 months in advance. I also managed to redeem DUB-MEL on QR via VA as well for myself in July, booked 9 months out. I have also just redeemed 104k on ADL-NGO for January, booked 4 months out in SQ J.
There is no way I would be able to redeem for those equivalent flights as a mere QF Plat, especially in peak season to EU where QF embargoes J redemptions.
With UA blocking inventory to partner airlines however, using VA points to US is significantly more challenging. Your best bet to the US would be to redeem VA miles on SQ, followed by QR, or NH if booking on short notice in an off-peak season.