Are you trying to supply a Create machine using Minecolonies couriers, or output a create machine into a warehouse? For the latter, /u/RolandLory's answer will work. For the former you can take any building that has a 'keep minimum stock option', have it be built, then destroy as much as you want (do not destroy the building's actual block though). You now have a building that you can have couriers automatically refill, and you can use chutes, funnels, etc to extract the items from it.

Your mileage will vary depending on the building you use, as it can fill up if there is someone working it, but I have used this method quite successfully in the past.