What I know for sure:
I have 5 cables coming through deck glands into the boat:
VHF, TV, Anemometer, Radar power (it's wireless), mast lights.
The light cable somehow manages to power the masthead anchor light, the steaming light and the deck light.
The switches on the panel are reasonably logically ordered:
1 is anchor (3A)
2 is steaming (3A)
3 is deck level nav (7A)
4 is deck light (7A)
I can see why that has been done, to keep nav together, but I would have preferred a cascade approach, anchor, steaming, deck, deck level nav. No big deal.
(Number 10 powers the radar, radio and VHF)
What I DON'T understand is how anchor, steaming and deck light, all coming off different switches can be powered by what appears to be one cable.
What I have thought of doing is:
Take the steaming light off 2 and connecting it at the panel to 3. Ideal as when motoring I now have the three necessary lights AND a spare switch for a tricolour.
This would (presumably) mean running a cable from switch 2 to the top of the mast for the tricolour but the NASA I was considering
https://www.nasamarine.com/product/supernova-combi-tri-and-anchor-l-e-d-mastlight/ relies on a Heath Robinson 3-way switch that needs mounting somewhere to chose between anchor or nav.
Not sure how to overcome that.
The reason that I like a tricolour is that I find when sailing there is sufficient bounce back of light onto the genoa to cause visibility problems. My forward nav light is mounted well inside the pulpit and reflects onto the stainless steel and then onto the sail.
I'll be interested to see what the OP decides.