Yes Jeff, you can do it with ease and I can too, but there are an awful lot of people who can’t and why take the risk? Restoring a thread lead can easily be screwed up. You also telling me you’ve never measured or calculated something incorrectly? What is the old saying? “If you’ve never made a mistake, you’ve never made anything?”
I will amend my advice then. If you’re a competent “DIY” type then go-ahead and shorten the thread….but make sure you have a spare bolt stood by if you’re doing it late in the day…..