DHCPv6 Static Leases - How to set uniquely per interface (DUID + IAID)?

[fabrizior]

Search turned up an old thread from 2012... "DHCPv6 and IAID+DUID or other means of selecting IPs by interface" that got me nowhere... So I'm wondering what am I missing 7+ years later, and is this yet possible on pfSense 2.4.4-RELEASE-p3? I don't see a way.

The pfSense Book section on DHCPv6 Static Mappings doesn't have anything to say on the issue of multiple NICs either.

Here's what I'm trying to do:
Have a Mac Pro with 2 NIC, 1 bonded 2x1gbps copper (bond0), 1 802.11ac (en2). Both interfaces need to be online simultaneously with separate static IPv4 and IPv6 addresses. The application/service-related reasons for the requirement to have both interfaces online with static IPv6 addresses are not relevant to the issue at hand. I'd prefer to assign via DHCPv6 rather than hardcode manual addresses on the Mac.
The need / use-case exists for multiple machines. I'm explaining only one case here as an example.

Without static DHCPv6 mappings, I see both interfaces in the DHCPv6 Leases Status view. Note the same DUID but two unique IAIDs "0" and "1", and unique MAC:

If I assign one static DHCPv6 to the Mac's DUID, then both bond0 and en2 "fight" over the single leased IPv6 address.

Is there any patch or other mechanism that would allow me to set the DHCPv6 static mappings for both interfaces separately?

Server logs:

Thanks for your time,
-Fabrizio