There are plenty of reformed JW religions around, they just aren’t as obvious as they are very mainstream Christian, don’t go door-to-door, don’t have blood transfusion prohibitions etc.
But check out:
- Laodicean Home Missionary Movement
- Independent Bible Students
- Church of the Kingdom of God
Note that CT Russell’s financial success also ‘inspired’ many others in his day to make similar religions with similar and sometimes even outright plagiarized the Bible Student movement although going in different directions and off course, the whole Millerite movement that CT Russell himself sprung off preceded and is very similar in eschatology to the JW (Adventists, Christadelphians, Ba’hai, Church of God …)