"​​​​I remember seeing a lot of people putting those old "7" quill stems on with 120mm reach or better. I've still got one on a shelf somewhere in the garage."
Now that you have mentioned, I recently switched the threaded fork of my Olmo for a threadless one, one of the main reasons is stem availability, is hard to find a longer than 120 quill stem or negative ones, the whole switching quill stems was a pain on the road bike , unless it was a quill stem with a removable faceplate (even harder to find).