Out of sight, out of mind. Keep keys very hard to access that would require doing something other than the most fun thing there is to do, and that is sitting on your computer.
Out of site is not out of mind, the only practice that I believe works best investing into Bitcoin, is investing money you don't need, taking you for instance, If you have 1million and use $100 on Bitcoin you won't be bothered about anything ,volatility or being tempted to sell your Bitcoin because you're at peace with that amount of money and can leave months off thinking about using it to solving your problems. This is when what the op is trying to say would align.
Another thing too that will also help one in keeping eyes and mind from bitcoin is to focus on how to make income. The reason why people have it mind to want to sell their bitcoin is because of low income and lack of fund but when their is increase income you don't need to put your eyes on your investment.
Investors needs to understand selling out their bitcoin to spend won't solve all other problems , and when bitcoin investment is tampered their is nothing to rely on but hoe to make income, it is just better never to rely on your investment, instead focus on how to make money because one will always need income to fix things up and not always on bitcoin hodling.