I certainly agree that the station is in desperate need of a spring clean. Apart from the lifting of the original Exmouth-bound track, the removal of the few concrete steps up to the original Exmouth-bound platform and the mass of undergrowth covering the original Exmouth-bound platform, the station is essentially still in the state it was in back in the 1950s.
See
here,
here, and
hereSadly, however, I would doubt whether any of your ideas will even get to the drawing board, let alone see the light of day. I suspect the costs of a rebuild would be excessive, requiring track realignment to widen the platform and a re-design of the access path as it is rather steep.
IIRC▸ , there was an article in the Exeter Express and Echo a little while back where the local councillor was calling for a
TVM▸ at Polsloe Bridge, but that seemed to get very short shrift from the powers that be - even though I have got on trains there when there have been as many as THREE ATEs on the platform!
As for building a complete new station on the site of the old Whipton Bridge Halt, which would serve the Devon Metro route between Barnstaple and Axminster once (if) that becomes a reality in the future, there is no space on the Up side for the necessary infrastructure. I doubt whether there is sufficient interest in having the two stations serving the same area - with little interest in journeys eastbound from Whipton Bridge or westbound to Whipton Bridge from the East Devon area