“Prefer to learn through immersion rather than understand how the language works” LOL

Rosetta Stone does have all the writing systems- romaji, kana, and kanji. You just have to toggle which you want.
There are 12… or 14 lessons, I can’t remember. With 4 units each.
It might not help you for a business meeting, but if you want to talk to people it will drill you enough orally that you’ll feel comfortable doing so. You have to make it through the entire course to find out, you can’t halfass it.

The word to picture way of learning actually does help you read, especially with remembering kanji.
I think it actually helps more in Chinese because Japanese totally screwed hanzi and made it more complicated. But it will help. With the kana you should at least learn how to read it first, but that literally takes a day, but most people learning whatever language typically learn the alphabet for that language before going for something like RS. Unless they just want to be conversational.

RS also has lessons on grammar, but it doesn’t sound like you made it that far.
If you need more help with grammar http://www.smilenihongo.com is an awesome website with a great teacher and she does YouTube videos.

If you’re going to review something you should use all of the features and finish the course first.