SG1 also has an AU!Carter coming for a visit in an early season, brings back the android SG1 team (and promptly kills them all off), and has an episode in the 9th or 10th season where a rip in the spacetime continuum leads to hordes of AU!SG1s showing up at the SGC. And SGA gives us an AU!McKay in one ep and a set of replicator-created clones in IIRC 4th season (who, like O'Neill 2.0, were created by aliens who wanted to experiment on SGC people without their absence being noted and initially thought they were the originals).
Well, see, gender swap shouldn't be any harder than casting for juvenile versions of main cast members for flashback episodes. And in some cases there's bound to be a cheat option where the actor in question has an opposite-gender sibling with a strong resemblance. (I'm reminded of a story I heard from the filming of X-Men 2, where Hugh Jackman's sister came to visit the set one day and for a joke they put her in a Logan outfit and gave her the Wolverine hairdo and sent her on for a take instead of her brother. Apparently the resemblance was so strong that it took a few minutes for the crew to notice.)
I'm starting to consider that you may have hit on something where fandom is interested in something that live action programs aren't all that keen on touching. You see lots of transvestite comedy, or angsty serious indy flicks about transsexuals, and I can remember one movie of the died-but-sent-back-to-earth-for-final-chance-at-correcting-unfinished-business where the individual in question was given the last-minute handicap of being sent back as a woman instead (I can't remember the title, but Ellen Barkin played the woman he wound up becoming), but I'm thinking the genderbender plot is verging on serious!issues territory in filmic terms, and hence not as likely to show up in SF/fantasy TV.
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Well, see, gender swap shouldn't be any harder than casting for juvenile versions of main cast members for flashback episodes. And in some cases there's bound to be a cheat option where the actor in question has an opposite-gender sibling with a strong resemblance. (I'm reminded of a story I heard from the filming of X-Men 2, where Hugh Jackman's sister came to visit the set one day and for a joke they put her in a Logan outfit and gave her the Wolverine hairdo and sent her on for a take instead of her brother. Apparently the resemblance was so strong that it took a few minutes for the crew to notice.)
I'm starting to consider that you may have hit on something where fandom is interested in something that live action programs aren't all that keen on touching. You see lots of transvestite comedy, or angsty serious indy flicks about transsexuals, and I can remember one movie of the died-but-sent-back-to-earth-for-final-chance-at-correcting-unfinished-business where the individual in question was given the last-minute handicap of being sent back as a woman instead (I can't remember the title, but Ellen Barkin played the woman he wound up becoming), but I'm thinking the genderbender plot is verging on serious!issues territory in filmic terms, and hence not as likely to show up in SF/fantasy TV.