MaruMori has a grammar srs option for all the grammar where you either have to type in the conjugation or the right grammar point, which often also requires some form of conjugation. There is also a separate mode where you can drill the desired conjugation as much as you want.

All regions including Japan

The Japanese website mentions that the global version can make use of all regions. Only the cheaper Japan version is region locked to Japan

Have been using MaruMori for the past 2 years for my kanji, vocab, grammar and some extra reading practice. Also what I use to study most frequent vocab from the books and games I immerse with

I'm really happy that I finally managed to finish reading my first novel. Reading this book as part of the MaruMori book club has really helped me to push myself forward to keep reading and not to give up.