Good question. In the beginning I was also worried about that so I thought about if I could potentially just use minimal kanji or something but it didn't seem possible so I was kinda giving up. But then I check how Undertale and Deltarune did it and realized they actually did't use any kanji at all (except for some certain part I think but that doesn't matter). They basically put spaces between words like in English so it's actually readable even if it's all hiragana. And yeah, that's what I plan to do.
And don't worry, I will definitely notify you when it's done and will make a community post and everything too. I might even try to contact Temmie to ask if she would be willing to put it in the description of the game or something so more people could see it but we'll see.