Since today, PPP Widget 3 is available on Google Play.
Once more, nothing seems to have changed except for the icon color - but again, there are fundamental changes under the hood.
You can read details about these changes on the PPP Widget 3 page. The short version: it now supports most non-PPP modems, including 4G/LTE models.
Tested - among all older PPP modems - with Huawei E3272 / E3372 (NCM mode), ZTE MF823 (ECM mode) and Huawei E398 (QMI mode)