Lens question - 56mm f1.2 or 90mm f2

In November this year I will be photographing my wife's nephew's wedding. I am not the official photographer, so I have the freedom to experiment and follow my muse while the official photographer handles the "essential" elements of the wedding (this is an Indian wedding that will spread over 3 days with plenty of ceremonies, both during the day and in the evenings).

Some constraints:

-  Mostly low light conditions, as most events will be indoors. I don't think a lens slower than f2 will cut it, so I plan on leaving my Fuji 10-24mm f4 lens at home.

-  Crowded spaces with lots of people - Indian weddings tend to be quite improvisational -even random - compared to western weddings, so I will have to squeeze in between people and find my space and viewpoints.

-  I want to blend in and focus mostly on candids of family and friends.

-  I want to avoid flash of any kind.

My plan is  as follows:

-  Shoot predominantly B/W (Acros simulation), although I will shoot in RAW+JPG mode to give me freedom later on to process some images in color.

-  Weld the Fuji 23mm f2 to my X-E3 body; I love the field of view of the 23mm lens, and find myself using it a lot when covering events with friends and family. The X-E3 will be my primary body.

-  Rotate various lenses on my X-T20 (the secondary body) depending on the situation - I own the Fuji 35mm f2 which should give me tighter shots, and the Fuji 50mm f2 lens, which should be good for portraits.

- In addition, I plan on getting the Fuji 18mm f2 lens for when I need a wider field of view than the 23mm lens. This will also go onto the secondary body (X-T20) when needed.

My question - is it beneficial to get the Fuji 56mm f1.2 lens (which I covet, but am not sure I need), or will the Fuji 90mm f2 lens be more useful to get close-ups? Or should I just not bother getting either lens as I will be well covered in terms of lenses?

To give you a sense of the kind of photography I am planning on doing I am attaching a few images from a friend's 50th birthday celebrations recently.

Thank you all!

Mahesh