The Pilgrims eventually went down to a 3-1 defeat but there were positive showings from the few first-team regulars on show.
Argyle will welcome the Robins for a game that represents a genuine opportunity to pick up some silverware in this strangest of seasons.
"We lost at Torquay but played some decent football, and it gives us a further indication on who we are looking to advance to first-team football next season," said Ryan.
"It was a good test for the girls, especially the younger ones. It was a physical game and nice to get them out on the pitch again.
"We have an Under-23 squad at the club and I've not had the opportunity to watch them play much this season, due to the obvious limitations on games and fixtures often clash with the first-team.
"It was a chance to look at younger players and see if they are at the level required. I'm a little disappointed that we lost to Torquay but it did highlight who can cut it in a tough environment.
"There were only four first-team players involved and they were the best players on the pitch, from both teams. The Bideford game is one where we know we will be clear favourites and a totally different scenario to our league programme.
"There is an added pressure because the Devon Cup is a competition we would love to win."