Only if you persuade the Ed to do it for you as a personal favour. Seven years ago there was a 'username amnesty', where members were invited to submit the names that they'd like to be known by in the future ( https://www.theanswerbank.co.uk/AB-Editors-Blog/Question1216545.html ) but since then the various Eds that we've had have been reluctant to endorse any name changes.
I'm glad to say that I do not consider the history of my postings on a site such as this to be of any great significance, important in the scheme of things, and worth worrying about.
Ok, thanks all. I'll keep it as it is. I just wish I hadn't chosen a long name.
Re: my history, I'm getting forgetful and I pop in to my history to remind myself what subject(s) I've been talking about.
Thanks again.