How to safely remove a redudant heart beat

Envirnoment:
Solaris 2.6
SC 2.2
2 node cluster
dual heart beat network
I need to remove a network card to free up a PCI slot in each node. All of the slot is filled in both nodes. The single ethernet card is currently one of the two heart beat.
Can I safely run only one heatbeat, knowing that i loose redudancy there? If so how do I go about doing this with the minimal impact to the cluster reconfigurations?
i.e. can i just deconfigure the network card and then update the cluster to only use the other network card as the heart beat?
Thank you in advance for any help.

Cluster 2.2 has a requirement to have 2 private networks so you can not remove one.

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