Male Bspp X Female Bspp Swivel

Both wrench flats are 27mm, same size on each end, so you can use the same wrench throughout without swapping. At 45mm overall length, there's enough separation between the two engagement points that a standard open-end or combination wrench sits comfortably on either flat. Tight quarters can still be a challenge depending on the surrounding hardware, but the geometry here doesn't create any unusual access problems on its own.

On the port side, it’s a BSPP male G 5/8 - 14 on one end and a BSPP female swivel G 1/2 - 14 on the other.

Yes it will. This straight fitting is designed to connect those exact sizes and thread types.