Assuming that your identity file name stays constant, the quick and easy way would be to specify your alternate id file in your ~/.ssh/config file.

You can do this on a per-host basis.

Something like 

Host Box1
   IdentityFile /home/goober/.sshalt/id-alt1

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In reply to Re: Specifying identify file with Net::SCP by andyford
in thread Specifying identify file with Net::SCP by Mutant

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