Technically no. You can mechanically phase the head so that the blade has 90 degree procession to it. Example, if you put one blade directly over the boom and push the elevator stick forward, the blade will not move up or down in pitch. There are some heads made that have links made up with that in mind but they also need a very large opening in the doghouse to clear the linkages. There are some that feel that a head with a small amount of flexibility in the grips (purposly make to flex) is the best way to use a non-3 axis gyro heli with the scale blade setup (no matter how many blades).
OF Helitechnik and Century make heads that will work without 3 axis gyro installation but with the fairly low cost of those systems, it is easier to install one than to go without. There is a very large learning curve to the flight characteristics of the multi-blade heli without the 3 axis gyro, as it has tendencies to balloon going into the wind and can be quite a handful in breezy winds. I have three Skookum 720's and one Align 3G system in my scale multi-blade heli's. I have a standard Align two blade head with soft dampeners on my Jet Ranger, two Century multi-blade rigid heads on my AS350 and 500MD TD, and a four blade RCA rigid head on my A109. All fly very nicely but I would not even bother trying to fly without the gyro on any of them. I like flying, not working while flying. Just my take on it. Take care.