Hi Michael
We resisted this for the reasons you have identified, a 603 certificate is not a billing system, however the team became tired of arguing the point with conveyancers and so we relented.
Yes we have an ELNO BPAY biller code which shows on the reverse side of our 603 certificate. Having a separate biller code has been very helpful in identifying settlement payments as opposed to ratepayer BPAY payments.
As you have also identified BPAY will not approve the use of their framework without the BPAY logo, we have this on our certificates, albeit somewhat despondent about doing so.
I hope this is helpful.
Regards,
Andrew