Help with soil mix for flower?

My first grow - I’m about to do my final transplant into 10 gallon containers, and I know I will put a supersoil/perlite mix at the bottom 1/3 of my container.

But for the top 2/3 of the container (regular soil) I was reading I should mix 1 part compost with 1 part peat moss (and/or coco coir), and 1 part perlite.

For the 1 part compost, can I replace it with 1 part super soil? I have super soil on hand, but no compost. (I live outside of the US in a country where it's very difficult to source organic ingredients. What I currently have is: organic super soil, perlite, peat moss, coco coir, and soil sourced from a local forest).

Just trying to figure out how to mix the top 2/3 layer of soil.

Should still work to start off some plants but you will need compost later on. Start up a backyard compost pile, worm bin, or bokashi bucket. You don't have to buy compost; home made is actually better and costs nothing but raw materials.