I know you are probably not looking to buy a new iPad but have you considered the 12.9? This is what I use for 80-90% of my work at the office and when traveling. I do a fair amount of international travel which span 10-14 days–usually in Asia. I never take a computer–just my 12.9 iPad Pro with the Smart Keyboard. This has worked adequately and with iOS 13 around the corner, I suspect it will be much better. Just a thought. Otherwise, I’d use the 11", get a Smart Keyboard and plug into a TV or take an Apple TV with you.
This is a little dated now but here is what I wrote after 30 days iPad only: Update: Results of my 30 day iPad Exclusive Use Experience