May be we need more details when you say load balancing on what is the end goal.
Are you looking at splitting the interface to be used for multi traffic like Sub-interfaces ?
I hope I have understood your question correctly, You want to balance traffic coming in to a Firewall between a vwire internet link and a L3 internet link.
A Wire Interface will put all the traffic that is received on it on the second Vwire interface that is part of that 'VWIRE'. There wont be any routing decisions made on it with respect to balancing the LOAD. It will not be possible to split traffic between a Vwire interface and an L3 interface.
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