It is surprising to me, considering the common use of Winchester steel shotgun buttplates on custom rifles - as well as on Winchester factory rifles - for a century, that a trap conversion has never been offered for them. As RR suggests, such an alteration would not be too difficult. An especially elegant conventional oval trap could be made by sacrificing a second buttplate, cutting an oval from it, and fitting the piece in place. I imagine a clever machinist could rig up jig and run off a few dozen of them. The advantage would be that such buttplates - the RR model or the oval trap style- would fit right onto buttstocks already cut for the factory plate.
