Another article or two to share on the Superfriends... and if there was a spinoff...
https://screenrant.com/supergirl-arrowverse-strongest-team/
https://news.yahoo.com/supergirl-showrunners-spin-off-series-020000131.html
A part of me would love a Midvale spin-off with young Kara & Alex but another part of me wonders how that would work as an actual series since they are now moving passed high school in these episodes and the sisters leaving Midvale.Alex is already gone and is just visiting in these two episodes.Unless they were to change canon which to be fair,they've already done on the show in this very episode via Kenny and the Arrowverse as a whole via using Crisis,I think they may be limited in what they can do.I suppose they could take the Smallville approach and keep it to a pre Supergirl Kara in collage with Alex dropping in regularly somehow.
Also,from the CW's POV,they probably feel they already got their Supergirl spin-off in Superman & Lois.I mean Superman & Lois is a spin-off of Supergirl.
With that said,I would love if there was some way we could see Izabela Vidovic & Olivia Nikkanen in these roles.again after these two episodes.I'm not sure how other than time travel again but I actually would love if there was some way young Kara & Alex could appear on Superman & Lois maybe next season and meet Jon & Jordan.Especially with Jordan dealing with his emerging powers and Jon struggling with now being in his brother's shadow and giving up his life in Metropolis as the Alpha for his twin's sake.Again,you would need time travel but I think young Kara & Alex interacting with Superman's sons would be a fun idea for a episode or two.
ETA
I can imagine young Kara & Jordan really bonding and Kara helping Jordan with his powers in a way that Clark can't due to the block that can happen between a parent and child as well as Alex & Jon connecting as the non powered siblings looking out for their sister/brother.
Plus I think Kara would be thrilled learning she will have more family and meeting half kryptonian/half human twins.
Even if you mindwipe Kara & Alex when they go back to the past or use Crisis to rejigger canon,I still would love to see this crossover.
end of ETA
But I will also admit that I would love to see Melissa & Chyler appear on Superman & Lois too and have the adult Kara & Alex interact with the boys as well.lol