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Does it have to be an injection?
I mean, in my head (could be just me) when i hear Morphing and Transformations like this I think of Sci-Fi.
If we go the SCI-FI route then maybe by-pass the needle, injection and have the old 'Mad Vet / Scientist develop
a chamber. Inside this chamber, if you will, is where the morphing takes place.
Maybe, morphing is better than transforming anyhow. Because transforming he would go from one thing into another.
But, by morphing he would combine the two. Therefore, he would still retain qualities of the first thing, even though
he appears to be the second thing. Did that make sense?
In other words :
Transformation would means A or B
Morphing would mean A & B
Don't mind me, I'm just ramblin' on ... time for bed ... LoL