If, for arguments sake, I booked to LGW-UVF on reward availability, then UVF-GND as a Reward Flight Saver, would it be possible to check baggage through to GND from LGW?

(Looking at this as a potential plan B if F/J availability exists to/from UVF, but not to GND - it seems that there is often plenty of WTP availability as RFS between UVF and GND)