I'm not sure what you think is so special about moonbeam. It still can't target something that has total cover, which is what you are trying to do - you are trying to summon it here and then move it there, to a new target. There's still nothing allowing that particular spell to ignore cover.
Is it that wall of force is transparent? This was specifically addressed by Crawford, and it doesn't make a difference; it still counts as full cover. If it makes it easier to understand, imagine wall of force as an adamantium dome in this situation. You can move moonbeam on top of it all you want; it ain't getting through. According to RAW, anyway. Your campaign, your rules - if I was a player and you told me it was transparent so moonbeam could go right through, I would be fine with it.