The same way you do the rest of the time. Fly, land.
A CPL/IR is a CPL/IR and is not an ATPL. Reminder time: THERE IS NO SUCH THING AS A FROZEN ATPL. If said CPL/IR took the ATPL exams he can in due course take his ATPL skills test and get his ATPL, allowing him to legally act as P1 on a public transport flight. Until that point he is exactly the same as another CPL/IR who took the CPL/IR exams in terms of privileges.