Yeah, I am interested in that. Note that the Yohannesian market is a big market, so there's no possible way any one nation (not even someone who roleplay as Lyras like nation) can flood it. There will be lots of Nihonese cheap goods, yeah, but it won't be like in real life, where everything's 'Made in Japan' (back in the 1920s, at least concentrated on the Dutch East Indies, 'Made in Japan' was pretty much the same as 'Made in China' today)
Will your nation benefit a lot? Yeah, definitely. I am thinking of writing something - along that market line - that I reckon you will like (hehe). This is why economic RP can actually make your nation 'stronger' (if that's the simplest way of saying it) a lot easier than going to military RP, and you will see what I mean. You can think of it as my Christmas present for you
By flooding I mean exporting a lot, not overwhelming it so do not worry. I also hadn't had a proper diplomatic RP for ages... so you are welcome.