The SB-5000 should be comparable in power to the former SB-910 (which is one I have). However, I'm not sure about the WR-A10 adapter. According to B&H, the SB-5000 comes with a soft case, incandescent and fluorescent filters, diffusion dome, and a stand. Nothing is mentioned about the WR-A10 adapter.
I had problems with one of my batteries leaking into my SB-910 which required sending it back to Nikon. The bill was over $200 because they also replaced the flash bulb (hardly ever used the flash but they considered it to be required maintenance). I got about 100 flashes out of the repaired unit when it failed for an unknown reason.
Now I tend to use Godox flashes instead of the Nikons (I also have an SB-700). The Godox have built-in receivers but require a trigger. The Godox VING V860IIN TTL Li-Ion Flash is comparable in power to the SB-5000 but costs a lot less. In fact the XProN TTL Trigger with this flash only costs $248.00 which is less than half the price of the Nikon. And a more powerful Godox AD200 can be added to the arsenal. Personally I find Godox to be great while being much more affordable.
I hope you will receive some answers to the WR-A10 adapter. Sorry I can't help you with that.