TL;DR: pfSense on a VM, multiple virtual interfaces (each with a different network) connected to the same physical network. How bad is it gonna backfire?

Context:
Our infrastructure is on Hetzner (why this is important in a minute)
Due to several reasons, we started migrating our physical firewalls into virtual machines (with a network refactoring, splitting a big /16 (logically partitioned) into multiple /24).
The problem is that our provider (Hetzner) limits the number of VLANs to 5 (4 of which were already occupied, so we were left with 1).
I already tried contacting the provider's support, and it looks like the limit is not increasable.

What I did:
After searching on the net, I did not find any satisfying answers on how to approach the issue, so I managed to add multiple virtual network interfaces to the pfSense VM (one per network).
All the virtual interfaces are connected to the same VLAN in this case.
I am gonna limit the IP of each VM via the Hypervisor firewall (to avoid spoofing on other networks) and we are not going to use DHCP.

My question:
How bad is this gonna backfire on us?
Could there have been a better way to do this? Maybe directly in pfSense?
From my research, I did not find any (new) posts or content on how to manage this.

Thanks in advance!