The road to Broadway has shifted for two new tuners, with both “Diner” and “Honeymoon in Vegas” changing plans for tryout runs that were to have preceded spring stints on the Main Stem.Reps for “Diner” wouldn’t confirm any moves regarding the production timeline of the show, but word is that the musical version of the 1982 pic — the first legit outing from Sheryl Crow — has postponed the preem originally set to play at San Francisco’s Curran Theater Oct. 23-Nov. 18. But it’s also said that the show — with songs by Crow and book by Barry Levinson, the writer-helmer of the film — remains on track for a spring Rialto bow. It’s not yet clear, however, whether a tryout run for “Diner” would materialize in San Fran or anywhere else ahead of the targeted Main Stem berth. Initial details were scant on the reasons for the switchup, but it looks as if the move is being made more due to production logistics than because of wavering confidence on the creative side. Helmed and choreographed by Kathleen Marshall (“Nice Work If You Can Get It,” “Anything Goes”), “Diner” for now officially remains scheduled to play the Curran Oct. 23-Nov. 18 ahead of Rialto dates that are still set to be locked in. Producers for “Honeymoon in Vegas,” meanwhile, have nixed a Canuck tryout outright. “The New York producers have decided not to open the show in Toronto this fall because of scheduling issues,” said a statement from the show’s reps. “Future plans for the production will be announced soon.” There’s no word on how the move will affect the production’s proposed Broadway bow, although the shift does seem likely to delay any potential future life. The tryout stint, originally skedded to have played Toronto’s Royal Alexandria Theater, would have starred Tony Danza in a production helmed by Gary Griffin. Jason Robert Brown (“Parade,” “13″) penned the score for the musical with a book by the writer-director of the 1992 film, Andrew Bergman. Dena Hammerstein, Roy Gabay, Dan Farah and Katie Face Prods. produce.