Have you considered adding some simple switching circuitry to your design to increase it’s driving capability? An N-channel MOSFET is often used for such a task (along with a couple resistors to ensure proper operation). Doing so would afford far more flexibility when it comes to selecting an LED for your application.
Not sure what you mean by “terminal” here… If you mean a footprint for an antenna connector, then sure, why not? If I was in your shoes, I’d probably duplicate what Adafruit did on their breakout board:
This way, you can try a simple whip antenna like I mentioned before and test it’s performance. If it doesn’t cut the mustard, you could then replace it with an SMT uFL connector or an SMA edge-mount connector and try a higher-quality antenna.
If you mean a module with a chip antenna or a PCB trace antenna like those shown below, then you’re probably not going to find much luck there. These antennas are less common on sub-ghz modules. This is especially true for LoRa modules as most applications prefer to take advantage of their long-range capabilities.
