I would definitely caution you in interpreting this verse too literally or misinterpreting it altogether. It's not a command, as you say, but more like pointing out the obvious... you will bring forth children in sorrow, not you must bring them forth in sorrow. Does anyone know what word the Septuagint uses here? I'm wondering if it has a connotation of pain at all.
There are plenty of sorrows as well as joy that come from having a child. Pregnancy is no picnic to begin with, or at least mine haven't been. The list includes show-stopping morning sickness, swollen extremities, mood swings, heartburn, sciatica, shortness of breath, and the list could go on and on depending on the woman. Then you get into labor and now we're talking about the kind of pain that makes everything else she went through seem like a far-away dream. This is the kind of pain that obliterates all other senses to the point that she has no awareness of anything else but the pain and the searing intensity of each contraction (when it's at the high point of labor and they're coming in waves with no let up in between) truly makes you think it would be more pleasant to be cut in half with a butter knife than to endure any longer. If she's lucky it will be a short labor, but mine was twelve hours and I could only make it through the first five before I was at the point described above. I've had friends talk about being in labor for 36 hours without pain meds and once the baby is born, yes, mom will forget most of the pain. I was also induced and had an epidural. The key to having the two work together without slowing down the labor process is to wait until she's at least 4-5 centimeters dilated. Epidurals can slow down the contractions, which would also make the dilation slow down as well and once your wife was induced, she really needs to deliver the baby within about 24 hours to reduce the risk of infection.
Just as a suggestion, please leave the decision up to your wife in the end. I respect your wanting to be a spiritually upstanding man and to honor God through this experience, but for your wife's sake don't rule out pain meds. If she can handle it without, great, but there's no Super Mom award for birthing without an epidural and I think when you see her going through the blinding pain of labor without anything to ease it, it will break your heart. Just keep your options open and remember that no matter how hard it is for you, it's not comparable to what she's going through.