That will give you a really low gear - very spinny with fast acceleration but no real top top speed. It's difficult to get a regular old school BMX freewheel lower than 16t, ACS used to do a 15t but if you are using a flip-flop hub (threads both sides) then on the smaller side you can fit as low as 13t which would give you a much better gearing closer to a 44/16. Chain will need to be 1/8 for the Redline Chainring.
Marty