Surprised that 150 have viewed this posting,and there were no thoughts on the posting.
Although
GWR▸ stations in past times, these days they are TfW and
XC▸ as you pointed out - and will only generate peripheral discussion here (same thing for Caldicot). Current GWR trains divert, without stopping, through there when the Severn Tunnel is closed.
They ARE included on the Freedom of Severn and Solent ticket and on my list to visit at some point; Lydney (Junction) to change to the Forest of Dean railway up to Parkend.