There is no power control from a Sekonic L-758DR meter (there is from the much newer 478 models). There is group control for triggering, but that's it. Whether you have the TTL units or the PlusIVs probably doesn't make any difference, since the Plus IVs also understand the PW group control signaling.

In addition, the main reason to get the TTL PW units all don't matter with a Fuji camera body. You won't have TTL. You won't have HSS. You'd only have remote power/group control--if you can use them on a non-Nikon hotshoe (I think you can; not 100% sure, so I'd check). Overall, in my opinion, it's a waste of $400+ dollars to get the flex/mini combo just to have group control from your meter.

You can control the power of the flash from the on-camera TTL radio transmitter. But there are a lot of just-as-reliable, much cheaper, fuller-featured triggers using 2.4 GHz that are roughly a quarter of the price of the PW TTL units (e.g., Godox X1). And you can still trigger your lights for readings with the meter if you simply cable an additional transmitter to your meter, or use the test button on an in-hand transmitter. Again, paying a premium to simply have built-in triggering/group control may not be worth it to you. Maybe it will. Just remember that trigger expenses multiple along with the number of lights you use.