Now as I understand the position the pilot could not call for vectors onto the ILS either because he would be commencing / entering IMC during the approach or because he would not become visual before his rating minimium.
Then he diverts somewhere else, just like any other instrument-qualified pilot who finds that, despite his intended destination meeting planning minima, the actual weather does not.
And if he finds this reduced level of operational utility frustrates him, he goes and gets an IR like everyone else in the world who doesn't want to be limited to making approaches in visual conditions. In order to do so, all he has to do is those extra few hours of training that take his dual IF total up to 25, and pass a test of his competence to fly IFR, including instrument approaches.