You are asking if you can travel by car from London to Edinburgh with out using fuel.
Everything has a price, and the price of making increase is a DEcrease in honey take.
Over the years I have pondered long and hard over this issue and there are two answers. Get your wallet out but as near every beekeepers wallet/purse is stuck fast with propolis the only answer realistically is from the bees.
You say you nave four colonies. Run three for honey and use one for increase. Now to justify that 25% drop you want to maximise the output from the sacrificial lamb. So.
Build it up on a double brood. If you have the skills do some Queen rearing and or break it into nucs and over winter them. Say 20 nucs. There is as much increase as you can probably handle or if too much sell the survivors in 2017 to buy the kit you will need for the following season (2018) and repeat until you are at the level you are comfortable with.
Just remember there is mony a slip tween cup and lip and the biggest for us is weather. Remember the summer last year and the likelihood of better weather this summer is poor I believe due to the El Nino, and that is possible for the next few years so do keep it in mind.
PH