If I am to get an iPad pro, a keyboard and a mouse... I would rather spend that money on an Apple Silicon mac. Although no pricing is revealed but if I were to spec an iPad Pro with the accessories, it pushes me past MBA territory currently so i doubt if the new ARM macs will be priced higher.
So to answer your question: ARM Macbook 12" would be ideal.
So to answer your question: ARM Macbook 12" would be ideal.