So the headlamp was fairly easy to convert. I filed off the wing light panels, then I found that the reflector (and lense) were easily shoved out of their houising. So that got the wires out of the way and I could file the base of the lamp.
A piece of 3/4" dia pipe and cut off a slice, then cut a piece out of the slice to allow it fit the round part of the lamp casing. The cut out piece then went on top, followed by a chiney cut from a shower curtain glide.
As the latter was a disimilar plastic, I decided to drill through it, and the band I had glued around the lamp, before glueing in position with a short veneer pin inserted to stop it breaking away.
The platform on which it was to sit was cut out of another cut off, This was then glued and pinned to the edge of the smokebox. I brought it in the house so that the glue would set, then back into the shed to mask the boiler and spray the smokebox, firebox, and the belly of the boiler underneath the footboards. Again it was brought into the warmth of the house to rapidy dry out.
Once dry, it was out into the shed again. My better half is very sensitive to the odours of ABS glue and spray paint!
The wires were fed through the lamp platform and the light glued in place. Again brought into the house to set the glue. Took some pics but deleted seven out of the ten (looked as though I had the DT's!).
The first pic of the dismantled headlamp failed to post properly. Don't know why, althought it was taken two or three hours before the other!
Edit: Re-downloaded the pic from the camera which worked!