Has been suggested numerous times ranging from something similar to the 50’s Riviera Line in TSC to modern day. DTG don’t seem to have bitten yet. Also important to remember anything late 90’s onward hindered by DTG no longer having a licence for GWR or their FGW predecessor and neither of the Cross Country operators. So any rendition of the route would have to be in BR Blue at the latest, which DTG now seem to regard as something of a pariah.