I believe such product is possible; but it will be developed thru industry colorations. It requires making the best use of licensed and unlicensed spectrum.
Will I want one if such product exist as you descried? The following is my thoughts:
• No, if I’m out for a short time that I just want peace and quiet.
• Yes, If I’m out for extent time that I want to upload pictures to social media and connect with family
• The product will have to be UL. I will not buy it if it weights two pounds.
• I think you should work with industry to install more small cells everywhere as opposed to carry the unit yourself
Good luck with your project.