I suggest adding a cheap (200-300 m) factory to the game that builds the "utility units", namely the units that can be morphed from various fixed structures, and which have this ability due to being considered units of too universal utility to be restricted to a single factory.
The problem of relying on morphing for this is that it adds a significant amount of micro to the proceedings. It can also communicate the wrong idea to allies.
If you decide to make a line of radars with the intent to morph then, you will have to deal with allies who think you're being a silly newb and overbuilding radars. The same concern applies to the cloak and shield. The extra micro and concerns over allies make it bothersome to try to use these units in any significant numbers (or at all) if you don't have their factory, which may be the reason why I rarely see anyone doing this.
Also, having a small number of units in the game that can morph is not intuitive, and is easy to forget about. A factory on the build menu is much easier to spot and remember.
I don't know if this factory should replace morphing or exist alongside it. If it were implemented, morphing would become sufficiently redundant that perhaps it should be removed.