Top of the line laptops from e.g. 2019 are very cheap and still competitive with current hardware for realistic use. You can find one with an i9 and 64gb of ram for $5-600, you'll just need to plug it in after a few hours!
Blowing the dust out does run into the problem of some laptops being designed to only open with use of a chainsaw. I've ruined a couple laptops that way.