HA over vlan on a trunk interface

On a two balance 1350 cluster (v7.1.2), we have a 2 interface LAG with a HPE switch. The LAG is a trunk with production and admin VLANs. We have a dummy ip for LAN interface. I understand the LAN interface is all untagged traffic. We want to set up HA, but we can’t choose the admin VLAN, only LAN interface IP. I’ve seen an old request for this feature, is there any progress ? Or a workaround ?