Complete newbie Cosplay [Servo Arms & voice modulator]

The Mechanicum desires a new servitor. Or in my case, a Tech Priest.
I've only done minor sauldering LEDs and attaching wires and such. Never done any actual electronics beyond that. But I am passionate and I recently got my hands on an FDM printer, and have been resin printing for several years, creating a few models myself in Blender and getting them printed myself. I'm currently trying to plan out and organise a fun project, this being to Cosplay a Tech Priest from Warhammer 40/30K. To make it absolutely perfect, there's some fancy electronics needed. My current electronics idea comes in two parts.

First part: Create buttons for pressing, maybe a joystick-like contraption to move a servo arm from a backpack. Key function is just to have movement either fixed or controlled.
This could essentially just be a thick plastic arm with some grabby hands, where it can move forward and do some grabby imitations, optimal would be full control where I can fully turn it around and do the grabby so it can perhaps have some personality if you will.

Second part: Voice Modulator. I like the techy-bionic-like voice you can hear from games such as Warhammer 40K Mechanicum, or similar. I've been trying to look online for something that I could probably take and maybe strip down and adjust, but then I stumbled on this:

And it made me realize either a Raspberry Pi or an Arduino in that case buying/assembling the "audio hacker" shield: Audio Hacker – Assembled

Either one or the other might accomplish it.
Would a single Arduino be able to do both, or would I need two, or maybe perhaps move to a Raspberry pi to have enough power and functionality?
I imagine having the controls for the servo arm set up on a vambrace so that I can control it.

I understand it's a huge project but just trying to nail the key functionalities and tools needed.

My Google-fu hasn't helped me out much in my search for ways and tools to make my idea come into fruition. Can anyone point me in the right direction, or have any suggestions into doing it?
Beyond of course "don't"

You could create a smaller scale mockup to get your idea moving. You will see the changes you need as you proceed. Start with your voice shifter, and as it gets "good enough" get parts for the movements, probably motors - for example; servo (180 degrees only), DC or stepper... and plenty of power to make it work. Keep asking questions.

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