I don't know Japanese, but aren't there also cases where you would want the original spelling? Glancing at a list of English loanwords in Japanese, I'm guessing

I don't know Japanese, but aren't there also cases where you would want the original spelling? Glancing at a list of English loanwords in Japanese, I'm guessing that for words like batā 'butter' or chāji 'charge' you could plausibly want the original instead of the romaji. Perhaps it's hard to say much more without knowing who these transliterations are supposed to serve. If it's a general Japanese-speaking population with limited knowledge of English, I'm not sure whether they'd prefer romaji or the original spelling.