Is it possible to get this block in survival mode before leaving Earth without using cheats?

If it doesn't have a recipe, no. However, I'm looking for suggestions for roundel recipes for the next update, so if you got one, yes please!

 I have one Matt,

White Concrete surrounded by white Concrete powder

Didgeridoomen, if you're interested in possible crafting recipes for uncraftable blocks/items, I made a thread with lots of ideas about that some time ago. It has possible crafting recipes for the roundels that were uncraftable when I made it, and a lot of other things too. I'll leave the link if you're interested.

Crafting Recipes Ideas Thread