Creating a posh british butler voice?

[Arquinz]

Hello. I recently started playing around with coaqui for a LLM cobot project and I would very much like to recreate a posh, british butler voice for the robot. I've been messing about with XTTS2 and cloning a voice, but I am not sure if it will be fast enough to process (Though i have access to Quadro 5000) or malleable enough to get that old, gentleman feel.

Any pointers? Should I consider fine-tuning?