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If I understood your question correctly there are tools to let you multiboot different RasPi OSes, but they are still all the same core OS really and you’re probably better off just installing the things you need into one OS. But you really want to minimise what you’re running, Rasberry Pi is very lightweight hardware not meant to be doing a hundred things at once. Its best to run as minimal hardware and software as needed for a single task to get the most from the platform. Eg dont just buy the latest and most expensive board option as it likely contains hardware you wont use but will be taking up the limited ram and some cpu power plus using power. Identify your requirement, buy only the board that lets you build a single use device and install only whats needed, rinse and repeat for other devices if you want to expand. Understand what the platform is, and its not a shrunk down PC and Arduino may be a better platform for many things too.
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