How can I change bonjour name between two computers?

I have two computers (an iMac and a Macbook Pro) and we use Bonjour chat at my company. My goal is to have different Bonjour names displaying to my employees, for example Peter (main) and Peter (laptop). It seems there is no way to make local changes in "my card" in Messages, since any change I make on the laptop will be filtered over to the iMac via iCloud, meaning that the same information will display in the chat windows for both my machines. The result is that there's always confusion about whether my employee is sending a message to me on my main machine or my laptop, and confusion occurs.

Can anyone recommend a way to differentiate Bonjour names or even the icon? There seems to be no way to, say, edit how my profile will appear locally on my employees' computers for example, it's all tied to the "my card" information that's synched through iCloud, and thus exactly the same on all computers I use.

I am using Yosemite, and my employees are using 10.9.