Shameless Self-Promotion:In several hours, I'll be launching InputStick Mod campaign as a part of "Transform the Smartphone Challenge". If you are an owner of Moto Z series device, you should definitely check it out.
Even if you your device is not compatible with MotoMods, this campaign is an excellent opportunity to get InputStick BT4.0 receiver at a reduced price. And if you already own one and do not need another one, there will be also a possibility to support app development and get new features. If you know people who might be interested in this, please share the campaign URL.