Per Disney’s website, Rider Switch applies to any guest.
“
Rider Switch
This handy feature allows adult Guests to take turns waiting with youngsters or Guests unable to ride.
What Is Rider Switch and How Does It Work?
If Guests in your party can’t or don’t want to board an attraction, you don’t have to miss out!
If a child does not meet the height requirement or a Guest does not wish to board a particular attraction, no problem! With Rider Switch, one adult can wait with the non-rider (or riders) while the rest of the party enjoys the attraction.”
https://disneyworld.disney.go.com/guest-services/rider-switch/
But, just because a guest can’t ride an attraction, does not mean Rider Switch is available for it, even with
DAS.
Also, keep in mind that DAS can only be used for attractions the DAS user will be going on. You can’t use a DAS Return Time and ‘Rider Swap’ the DAS user.
The Disney website has a list of attractions that offer Rider Switch; those attractions have a mechanism for doing Rider Swap.
You can ASK at other attractions, but are likely to be told no. The easiest way around it (and the one we use) is to get Fastpasses for those attractions. The first group goes in while someone from group 2 waits. When group 1 is done, we switch. If we have more than 3 people in our group, we divide ourselves up so no one is riding alone.
This is the list of attractions with a Rider Swatch.
Magic Kingdom Park
The Barnstormer
Big Thunder Mountain Railroad
Seven Dwarfs Mine Train
Space Mountain
Splash Mountain
Stitch’s Great Escape
Tomorrowland Indy Speedway
Epcot
Frozen Ever After
Mission: SPACE
Soarin'
Test Track
Disney’s Hollywood Studios
Rock ’n’ Roller Coaster Starring Aerosmith
Star Tours® - The Adventures Continue
Twilight Zone Tower of Terror
Disney’s Animal Kingdom Park
Avatar Flight of Passage
DINOSAUR
Expedition Everest - Legend of the Forbidden Mountain®
Kali River Rapids
Primeval Whirl