Possible to have different display names for super admin based on site?

Hi. I run a number of different sites on my network and have wondered for a while now if it’s possible to have a different display name per site I administer. So that within my network, my admin username is, say, “main”, and on my main site the display name is also “main”, while on site “XYZ” in the network my display name can be “xyz”.
I’ve looked for plugins – can’t seem to find one that does this. Perhaps someone else knows a hack or plugin? Thanks in advance.