I don't see why it won't work as long as the bulbs are not directly under the liriope's roots. Their root systems are so dense I seriously doubt anything could make its way up through them. You might plant the liriope, say, a foot apart and plant your bulbs precisely in the center point between the clumps.
The problem would come when it's time to reduce the size of the liriope clumps. You would have to be very careful not to cut your bulbs by putting the shovel in as close to the liriope clump as possible. This is how I do my daylilies and it really helps to wait to divide them until the bulbs are beginning to emerge in the fall. That way you know right where to put the space tip.

Thanks, Donna. I'm going to try it. Maybe a white varietyamong all the dark green... The tip about dividing in autumn is going to be very helpful. It's a new garden, and I'm looking forward to doing daylilies with narcissus in another area.