You're asking me how I would go about a truncated Season 3 rewatch. I'm afraid your question is founded on a premise that I don't personally accept. To be clear: I urge you to devise your own route in engaging with SLIDERS, but the path you'd prefer (truncation of Season 3) isn't one I would take.
I've written 10 SLIDERS screenplays. The first one, "Slide Effects," opens with Quinn waking up to discover time has been rewound to the Pilot. All his friends are alive and well, home is normal, only Quinn remembers sliding and the deaths of Wade and the Professor and the Kromagg invasion and the cliffhanger. The situation is revealed to be a Kromagg telepathic simulation along with all of Seasons 3 - 5.
"Slide Effects" was a plot by series co-creator Tracy Torme. It was the Season 4 premiere he would have done had he returned -- but he would have reset the show to after "The Guardian." My version of his story, however, erases "The Guardian" and all of Seasons 3 - 5 because to me as a fan, SLIDERS is the original cast with scripts by Tracy Torme and Robert K. Weiss and Steve Brown and Jacob Epstein and filmed in Vancouver. All these episodes set in Los Angeles strike me as an awkward Kromagg trick anyway.
Later, I wrote a 2013 reboot of SLIDERS which never went anywhere after the pilot script, but it led to writing the six part SLIDERS REBORN, my idea for what a 20th anniversary Netflix movie series would have been like for SLIDERS. REBORN made references to Seasons 1 - 5 in totality: the first script has guest-stars/doubles from all five seasons including Dr. Sylvius ("The Breeder"), Arlo ("Please Press One"), Jack ("Net Worth"), Ms. Hanley ("The Guardian), Amy ("The Chasm"), Sheilah Brice ("Slide Like an Egyptian" and "Heavy Metal") and the later scripts brought in Maggie, Diana, the Dream Masters, the dinosaurs, the super-intelligent snakes, the remote controlled cars that shoot lasers, the underground Morlocks and others. There's even a special script featuring Mallory and a role for Charlie O'Connell in the finale.
My feeling by REBORN was that it was important for a 20th anniversary story to respect *all* of SLIDERS, not just the two seasons and to declare that it is all canon and it's all SLIDERS so long as Quinn, Wade, Rembrandt and Arturo are presented as *the* Sliders.
So, when you ask me to be selective with Season 3 episodes -- that's not something I can do myself because if I were to be selective, I'd only want Seasons 1 - 2 and if I were to look at Season 3, I'd accept all of it, embrace all of it and find some way to reconcile and build upon it.