Thanks for your reply. Yes this is the simplest way I know of, but I guess heirs are just going to have to do some reading and hopefully resist the temptation of trusting some random coiner to help them. A foresee a lot of people in the coming years sacrificing security and sharing keys with the wrong people rather than undergoing the discomfort of learning something about how exchanges even work and how to process and broadcast partially signed transactions without making an error and sending sats into the void.