Could HMS Vanguard have carried 18-inch guns?

What if HMS Vanguard had been designed around leftover 18-inch guns?

There were too few existing guns, and an eight-gun 18-inch battery would have required a substantially different Vanguard design.

Only a few British 18-inch guns existed, so an eight-gun Vanguard would have required an unrealized production programme. The intended weapon may have developed toward a 45-calibre gun, consistent with earlier Royal Navy preferences, rather than simply reusing the shortened weapons associated with Furious. A battery of eight such guns would have altered Vanguard's layout, weight distribution, and supporting structure. This apparently simple gun substitution would have required a substantially different battleship.