I think your reasoning is sound. Besides the tax, which doesn't apply to you, there will be brokerage costs and bid/ask slippage. So it won't be a zero cost exercise. But possibly far better than having to pay tax later on.
AN1 CuFe sells its Crossroads gold royalty to Northern Star for $4M cash; says better than waiting for mine launch
Week 46 Wrap: Copper hits 2mth low as Trump threatens net zero pace; US rally fades; HotCopper’s picks