Both of the procedures you listed can be done with sedation, which do not require anethesia. Therefore they are less risky then a full surgical procedure. Of course, there is
a risk of death with any invasive procedure, but the cardiologist would be able to give you more detail about that, so please talk with them about it.
The larger question is does your father want to be this invasive at this point in his life? Is he able to make decisions at this point? If he cannot tell you, then try to think about what he would want. Both of these procedures are invasive, but they could potentially help him live a better quality of life. It is a hard choice! Good luck!