A similar strategy works great for me, but I frame it slightly differently based on my personal anxieties:

• I’m procrastinating this important task because it’s overwhelming
• But I can’t think about anything else because I’m worried I’m going to forget to do part of the task/some important detail
• To be able to relax about this, I’ll just write down a list of things I need to get done/don’t want to forget

Then, often, I’ll realize there’s a small part of the project that I am motivated to get done now so it’s not looming over my head anymore. Or, if not, I’ve given myself a Hemingway Bridge to starting the task whenever I do have motivation.