Yeah that's what I did and the registration went very smoothly. The hanko itself is large and cost 15,000 yen at Daimaru which surprised me but my Japanese friends said to get the fancy one so I did. The end result: three rows of Romaji in the form:
LAST NAME <-- larger font
FIRST NAME <-- normal size font
MIDDLE NAME <-- smaller font
As others have mentioned it's very boring but it matched my gaijin card exactly and therefore seemed to be the safest bet. Make sure to get the "Jitsu-in" type of hanko as outlined here:
https://www.realestate-tokyo.com/living ... nko-inkan/