Sure. The transactions are loaded via the JSON API get_transactions.
This uses the filter wallets_api_transactions. See here for documentation.
If you hook to that filter with a priority higher than 10 you can modify all the data that the frontend receives.
You could simply loop through all transactions and if other_account_name is the username of the admin, set it to something else. Please let me know if you encounter any problems with this.
with regards