I used the ATF-DW1 normal one on my Honda Vezel as well as Honda Fit with the same transmission system and Alhamdolillah never faced any issue whatsoever.
According to my research, ATF-DW1 Ultra is basically the Japanese tradename, the word "Ultra" has nothing to do with oil grade or specification of fluid as it is only the mark of honda lubricants in japan "HONDA ULTRA LTD.", such as Honda Ultra BF DOT 4, etc. In fact, it is absolutely the same as ATF-DW1 locally available. So, in my opinion, there is no need to pay an extra amount for the 4 Ltr. pack. Simply buy two bottles of 01 Liter Honda ATF-DW1 and it will get the job done.
The rest is your choice.
I hope it helps.