How can I snake wire from boot to radio area?

[notorious]

After accomplishing RNS-D to RNS-E upgrade I'm upgrading TV tuner with digital one. This requires snaking new harness from boot to radio area.

I can cut TV tuner harness to ease the job so I can put the wire through tight places without bothering with bulky connector and then solder the connector when done.

I'm worried about D-pillar trim that can only be removed with parcel shelf out. I wonder if I can cut some corners here.

Alternatively, I can try to cut connectors from both ends of existing legacy RNS-D tv tuner harness and just solder new connectors from both ends. However, my 7th sense suggests there will be more wires in the new tv tuner harness...

Any tips about snaking the wire from boot to radio the easy way?

Thanks.