Hi there, I believe you can do this with the "Identity Rewrite" function in ISE. Go to:
Administration > Identity Management > External Identity Sources > Your AD > Advanced Settings > Identity Rewrite.
Also, as a side note, it is always recommended that you use local admin/password for device administration and not AD ones. That way, if your AD controller gets compromised, your network administration would still be secured.
I hope this helps!
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