You might be able to do this although I'm not 100% sure if you can specify a trusted host that is not a domain member for a DC.
When the local computer is not in a domain, the following procedure is required
1. Configure the computer for HTTPS transport or add the names of the
remote computers to the TrustedHosts list on the local computer.
For instructions, see "How to Add a Computer to the TrustedHosts
2. Verify that a password is set on the workgroup-based computer. If a
password is not set or the password value is empty, you cannot run
To set password for your user account, use User Accounts in Control
3. Use the Credential parameter in all remote commands.
This is required even when you are submitting the credentials
of the current user.
To view the list of trusted hosts, use
the following command:
To add the names of particular computers to the list of trusted hosts,
use the following command format:
set-item wsman:\localhost\Client\TrustedHosts -value <ComputerName>