It depends on your tolerance. Both are weak for their respective drug classes. I could take them together and it would feel great but I have a 10mg/day habit with BZDs and fuck with opioids on and off so my tolerance is high.
Honestly, it's not a safe combo. If you are in doubt, do not combine them. I only combine the two drug classes because I know my tolerance and I know my limits. If you are unsure, err on the side of caution, or take lower dosages of both.
So the question is really, do you have tolerance to either drug? If yes, it might be doable, if no, DANGER WILL ROBINSON DANGER!