Yes I didnt mean Full TK, but Full Kryptonian Power Set with TTK like Black Zero used.
Conner for me looks more like a 22-25 year old guy [If I consider only the Gemworld Panels and I leave out the Smallville Panels].
Besides:
It isnt a big problem:
At the moment we are in the times of BIG CHANGES:
-Heroes in Crisis
-Doomsday Clock
will finish in the next months
-Young Justice will at some time return to Earth
And when Doomsday Clock,Heroes in Crisis end and Young Justice return to Earth this will be the time of BIG CHANGE...
You could simply make a soft reboot out of it [There was already a reboot during Rebirth as Superman and Lois became once with the Pre-Flashpoint Superman and Lois].
Just say the following:
2009 Kal El was 25-27 Years old and he died during Death of Superman, Kon El escaped out of the laboratory and he was 15 years old
2019 Kal El is 35-37 years old and Kon El is 25 years old
Just let Pre-Flashpoint and Rebirth becoming once [so Conner was there as Jonathan was born etc. etc.]
So you can simply say that between Clark,Diana....and Conner,Cassie are 10 years of difference...
With a 25 year old Cassie and 25 year old Conner you could simply use their Titans of Tomorrow Versions as basis, let them move to Gateway City, where Cassie already lives.
Conner could become the cool uncle for Jonathan, Conner being a kind of younger brother to Clark.
Gateway City is a big City, there they can live their own adventures
You can make a perfect mix out of:
-adjusting their own lives, finding the right way
-fighting against villains
-helping people [natural disasters, burning houses]
You could make 2 Series out of it:
1. Cassie and Conner [its the Conner/Cassie Variation of
https://en.wikipedia.org/wiki/Superman/Wonder_Woman ]
I like the idea that they fight as couple-Conner like the Powerhouse, Cassie using her strenght, but also agility....
2. Young Justice