Do I need monoflow tees

[Floresfarm]

Looking for some advice. I just recently removed my old single pipe steam system and in the process of installing a custom built wood fired hydronic boiler. Im going to use my old radiators in the system. Wondering if I should go with 1 loop where the return is tied directly back into it or doing a separate return loop. I know the benefits but im trying to keep cost down because this system will only be in use until Im able to build my new house less than five years. My question is will I need monoflow/venturi tees in this system? Thanks