I would not expect a random clip receiver to magically fix it. Power limits are basically the same across consumer Bluetooth so there is no secret high power mode. What changes is where the antenna sits. If you go the receiver route clip it high on your collar or backpack strap and run a short wire to the ears so your torso is not between the radio and the buds. Otherwise you are just moving the same problem around.
The boring fixes are the ones that work. Lower the codec bitrate or use SBC and keep the phone high on the same side as the main ear. Stations are full of access points and hotspots so you are fighting physics. Do the simple stuff first.
