The Wessex is safe for logging
I want you to be right, but
Phil Kemp sounds pretty convincing.
Much of this isn't necessarily safety issues if proper and adequate maintenance for the type of operation is developed and adhered to, but never ending maintenance, parts and downtime will rapidly render the operation uneconomical. As there is no history of logging with the Wessex, you will be developing it as you go - a very demanding situation.
One trusts that doing battle with the CAA hasn't diminished your war chest too much. Good luck!