1. Would you be interested in this tool? You bet!
2. What would be your top 3 texture transfer paths ( e.g. Victoria 4 -> Roxie, Michael 4 -> Rex, etc. )? V4 to Dawn, V3 to Dawn, V3 to Cookie
3. Are you REALLY interested in it??? If it moves the texture to the other figure without distorting it, absolutely. If it stretches or compresses the texture obviously, it's less desirable.

Now I'm going to ask the silly - but to me, obvious - question: which is more useful and practical to the end user: a utility that converts a texture map from one to another, or a set of UVs for target figures based on the UV-mapping of the source figure, with a utility that swaps the UVs dynamically within Poser or D|S? Would this be more or less difficult for the creator - to create UV mapping for a figure that aligns with that of a completely different figure - as opposed to both needing to map the polys of one figure to another and then ALSO engineer the migration of pixels from their original location to their new destination?