Not really. Royal and gold look amazing in jumpers etc.
You could quite easily rebrand your entire club. Fremantle did it recently and improved their look about 1000 times. The ability to rebrand here isn't in question and you'd be well served to package the returned full wings with a new logo.
I think there has been a significant shift in off field merchandise design over the past several years that negates the need for navy.
AFL merchandise in the 90s and early 2000s was garish and ugly. You could only be seen dead wearing it to a football game, and there were big splotches of colour and very in-your-face designs. Teams countered this by wearing darker colours to look a little sharper in the prevailing merchandise designs of the day.
These days the trend is much more sleek and minimalist. Designs are simple and elegant and fit together well. Other teams who previously used non-club colours for media polos etc have stopped using them (see Sydney and Hawthorn) because they are no longer required.
Royal blue and gold are beautiful colours for merchandise. A quick mock up of your current media polo and hoodie with the navy changed to royal looks like this:
I'm pretty passionate about this despite not being a West Coast supporter because a) i'm interested in jumper design and b) as a Port supporter I know what it's like to have an iconic, masterpiece of a guernsey being criminally underused.
The "We need navy for merch" line gets wheeled out all the time, and it's just simply not true in this day and age. Modern merchandise design doesn't require black or navy not to look garish. Royal and gold are iconic West Coast colours and are a really unique part of your branding that should be embraced, not be chucked in the back seat while the navy, gold and white St Kilda monstrosity is allowed to represent your club.
A rebrand for West Coast that is based around the Royal and gold wings as a home guernsey could potentially give you the best look in the AFL, IF you make the wings bold and not tiny and clipped like the current away, AND if you pair it with a sharp new logo that sits better on the wings so they don't have to be cut up so high, much like the classic, original logo did.