Can a Startup Studio and Accelerator Model Be Combined for Initiating and Investing in Companies?

They are fundamentally different models. With an accelerator - the entrepreneurs come up with the ideas and you provide limited resources. With a venture-studio, you came up the ideas and you provide resources to help. You will have a lot of complexity with respect to managing various conflicts of interest. Try to focus one model for V1. It sounds like you’re doing a venture builder. Focus on that for now.