[@KoL] I unfortunately won't really allow that. The Berserker form's seen as having more 'control' but also is less of a big deal innately. This seems to be general practice for those sorts of transformative Noble Phantasms when a Servant can be summoned with the transformation 'already active', like Berserker Vlad III. 

[quote]It's not a transformation left relying fully on rage, but since she is already in a beast-like state when summoned, the rank is lower compared to the time when it's used as a Noble Phantasm.[/quote]

Her profile explains this as well, so allowing that just seems to be at odds with her profile.

As a warning if you go through with the Alter version, though (which is fine if you'd like to use that instead)- the magical energy cost of maintaining her usual combat style of Self-Evolution and all that will be pretty significant. I just want to make sure you're okay with that.