I am not trying to tell anyone to sell their properties to buy Butcoin, I have more lands that's why I am able to sell for Bitcoin, I think it's wrong having a land or two and sell because of Bitcoin, but if you have more, it's going to worth the risk, nothing grows insanely well like bitcoin does.
Well, so far i can say that, if you have many lands in the backup which will help you out when the market will not go as you had predicted then in my POV, it eliminates the factor of risk as you have managed the risk with some collateral and fully prepared to bear the results in all conditions.
And for your question, you have given answers, like who should sell the land for BTC, well one of my friends shared once that he wants to sell his only property to buy BTC but his parents did not agree upon this idea and I said, they did good just like you advices here. Because it is not a good idea to sell land that you have only a small amount to buy BTC.
And I can say, you bought the BTC at a good price, and you could make 5x or maybe more in the next bull run just after the halving. So be prepared and do not fall prey to any market sentiments.