You'd have to disable client services for the connection profile. It would prevent you from pushing any profile updates, AnyConnect updates etc., but it will still work if you already have the desired AnyConnect software and profile on your clients.
Most importantly, the pre-deployed profile will need to denote:
<PrimaryProtocol>IPsec</PrimaryProtocol>
This will allow you to follow the procedure in this document while skipping the bits about using SSL for the initial profile deployment (and subsequent updates).