He would do the same as a pilot with an ir. The only real difference between the two is in their respective dh. I dont see why it is such a problem.
That would be true if it wasn't for the ban on STARs and SIDs, which requires the pilot to cancel IFR at the enroute section terminating waypoint.
Take
this flight for example (L to R). The pilot would have to cancel IFR at ILB, where the wx could be very different (at FL150) to the wx at LJPZ.
Re the SID ban, take
this flight for example (R to L). He would have to proceed VFR all the way to TRA, 47nm away, and he will have to climb to the enroute altitude by then, say FL100, without entering IMC. This means the EIR will be suitable for departures only in totally blue sky conditions.