It seems you are looking for a Large Format Printer to handle B4 paper size. They do not come cheap.
Knowing what you want to use with the printer could be quite helpful. Is the finished product the most important thing for you, or, will anything do? Knowing what you want as the end product may make printer selection simpler.
The composition of the paper and the inks used influence the type of printer (pigment or dye-based inks). Is the paper like that of a paper bag or does it have a surface like Christmas wrapping paper that poorly absorbs certain inks? What thickness (paper weight) will the paper have?
Yours is an unusual request on the forum. Hopefully someone with knowledge for your special needs will respond soon.