ok so the yellow is not running any AI business because its underpowered.
you can probably run a smaller model on the p2200. maybe qwen3:4b (with q4km quantisation) with ollama and a gpu accelerated whisper too but it might be tight on VRAM with only 5GB available.
how quick this would be is anyone's guess.
getting a newer gpu with more vram would help open up some options.
as for a new using a mac as a AI box. Its probably not the worst idea in the world. the mini's AI-Power/Cost Ratio is actually reasonable. however I dislike apple so would definitely go for a linux box with a nvidia gpu instead...
remember "fast" is going to be down to interpretation. its realistically not going to be as fast as some mainstream products with datacentres powering them.
then use a Voice-PE to interact with it.