Multiple OSPF ptp links through a single VLAN

Hello I have a quick question regarding ospf point to point,

Would it be considered a bad practice to use multiple point to point ospf links in the same VLAN ? (considering none of networks are overlapping)

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Here's the context:

The provider as two customer edge routers on premise.

There's two VRF configured one for internet and one for our extended private network. They can only give us one 10G interface per CE routers. (shapping limitations in the ASR920 when multiple interface are used)

vlan 10 as been assigned for internet

vlan 20 as been assigned for MPLS private network

The 10G ports from the provider are then connected into 2 different Nexus 3000 to slipt the 802.1Q from the provider. Internet vlan(10) is sent throught a pair of Firewalls.

Vlan 20 is then sent to our edge routers a Cisco 4331in access mode. A single interface per router is used to connect to the nexus 3000.

The L3 configuration is such that the primairy router from CE can only see our primairy edge router and the secondary CE can only see our secondary router. We aren't allowed to use both links wan links at the same time it's only for redundancy purpose.

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My collegue pointed out that since we use ptp ospf we should set different vlans for each connection to the different CE while I get is point and would tend to agree with him. I'm wondering if it's really a bad pratice. The setup works fine and changing it would require some efforts, calls to the ISP, change request, downtime and the new setup would be a little more complex in the end.

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I've been looking quickly around for an answer but haven't found one.