Hi Jeff. I think that the Dealer may be right on this occasion. ?? I don't know of any way of bypassing the immobiliser on a Lucas Epic Diesel pump. ( I assume it is the type with big round Plug in rear of Injector pump ) ??
Even People with programming Equipment usually struggle with these.
I would be interested to know if there is a way around them, But I Don't think there will be.
I would Bail out before getting your leg in too far or get someone with programming equipment to sort it out. ( if they can )