I've never hear of those two medications, so can't help you there, but I wanted to ask why you're so reluctant to take opiods for bone mets? Yes, you can become dependent on opiods, but that's not quite the same thing as addiction...
Dependency is described as a situation where you are taking a medication that you cannot suddenly stop without experiencing withdrawal symptoms. So, if you need to stop that med for any reason, you must taper off of it over a period of time.
Addiction is described as a feeling of wanting the "high" experienced (or numbness, or whatever) when taking a substance; wanting that feeling more often, increasing the dose and frequency in order to get that feeling, etc.
Many studies on pain management in the past 8-10 years have showed that people who take narcotic medications for pain DO NOT become addicted (although yes, they do become dependent). If taking an opiod will keep you free of pain, allow you to function more normally and allow you to experience a better quality of life, why not try it?
Unless there's another reason you're reluctant?