ZIC Coolant also seems fine and reasonably priced, and just like the Aisin Coolant which you have mentioned above, this seems premixed in 50:50 ratio:
https://zicoil.pk/product/zic-sk-super-a/
Still, I would always prefer Caltex over ZIC! 
Local coolant brands, like Osaka, Guard, etc. may be sincerely avoided.
I hope, it helps. Thank you.