Either one could work in that case, the Eliot Branch actually would be easier as those buses just go straight down Fresh Pond to Myrtle then follow the B20 route, and for the 63rd Drive branch, it would just take Metro Av to fresh pond, then myrtle then B20, but I don't think that any route like that should exist, based on ridership habits and practicality.
Tbh, the ideal situation would be to just give the Q38 more service, BUT that wont fix the delays on the side streets in Juniper Valley that delay the route, unless there is a strict traffic monitoring in that area to prevent it. Thats the best bet.
I see what you are saying, I can't believe that he would make the Q38 go to Flushing lol. Idk how he would route that one.