The Elgin-based athlete won bronze in Sochi four years ago and begins his quest for a second Paralympic medal on Saturday, when Team GB take on Norway in PyeongChang, South Korea.
It will be the first of 11 round-robin games which the British team of five will play, before hoping to qualify for the medal matches like they did in Russia.
Ewan (46) and Lossiemouth-based colleague Jim Gault were part of that glorious achievement in 2014, returning to a heroes' welcome in London and an audience with PM David Cameron at 10 Downing Street.
Both are members of the Moray Wheelchair Curling Club, along with Mike McKenzie who has competed in World Championship successes with Scotland's team in the past.
Gregor is actively encouraging other wheelchair users and people with any disabilities to try sport.
"We would love to see more come down to the sessions at Moray Leisure Centre, just to give it a try," said Gregor.
"Just because you are in a wheelchair life doesn't end," he said. "I thought when I ended up in a wheelchair that was it, life was over for me. Now my son and daughter cannot be more proud of me. You cannot explain that in words.
"Anybody with a disability, go out there and try curling. If you don't like it, try something else. There's archery, shooting, hand cycling, basketball, so many disabled sports for everybody.
"The Paralympics is the proof of that."
Ewan has been inspired by double leg amputee and fellow Team GB member Scott Meenagh who is competing in seven ski-ing events at the Winter Paralympics.
"I am disabled and in a wheelchair because of a spinal injury but he's got two legs missing and he's going out there showing people what can be done.
"It's brilliant for me just to be associated with people like that."
For more information on wheelchair curling visit www.moraycurling.co.uk/try/ or visit Moray Leisure Centre.
Gregor's efforts to take Britain to glory at the Gangneung Curling Centre in Pyeongchang will be televised live on Channel 4.
Coverage of their first match against world champions Norway begins at 5.30am.
Over the following five days, Team GB will play two matches a day to cover a gruelling programme.
On Sunday they play Switzerland and Finland, Sweden and Canada are Monday's opponents, Slovakia and NPA (Russians playing as Neutral Paralympic Athletes) on Tuesday, Germany and USA on Wednesday and Korea and China to finish the round-robin on Thursday.