I've read your other responses, and while I don't think my experience will assist you in an attempt to feel the emotion, it may assist in your ability to understand the emotion's desirability.

I find myself more productive when I'm happy; my mind has less cluttered thoughts, due to less anxiety and cognitive duress (I can only best describe this as a state when my subconscious works overtime on thoughts I'm only barely conscious of, and each time I try to deeply contemplate a new thought, somewhere along the halfway point it's unwillingly relegated to my subconscious as something I'm anxious over pops to the top of my mind).

I also notice a correlation between times I am unhappy, and a lowering in my self-confidence. Normally my confidence hovers right below what I would consider 'a level of confidence conducive to hubris', and when happy, it can tend to spill over into this danger zone. When unhappy, my confidence becomes akin to the normative level of confidence I've observed most people whom I've encountered to likely possess. This diminishing of confidence too lessens my productivity, and to reestablish my normative confidence level, I must then end my unhappiness.

Thus, for me, over-abundant happiness can be dangerous, but wading just above the happiness threshold gives me clarity of mind and purposeful focus. Hope this helped elucidate happiness's utility for you.
Cheers!