Light iceing conditions are presumed to exist at all times on an IFR flight.
Also the manual almost certainly says to the effect that with anti-ice inop despatch is allowed if iceing conditions can be avoided.
That's not an assumption you can make, even in blue-sky weather.
Nogo.
A short low-level VFR transit to the maintenance facility is a different matter, buy the question gave specific wx cnditions and is clearly an airways IFR flight.