About 7 years ago i started a project over at https://sptfy.com becuase i wanted short URLs for twitter etc with a name on that link i could trust, people started using it in a small scale. now it may be 7 years to late but a few weeks back i went ahead and updated the site to allow user registration, statistic tracking and a few more things as well as a design overhaul. It's a free service so use it or don't, the decision is up to you, i thought i just might say it's there
you can brand your own URL and link it to the artist, playlist, album or profile of your choice...
Example1: Random String : > https://sptfy.com/1G03
Example2: Branded String : > https://sptfy.com/sptfy
UPDATE URL SPOTIFY LINK
If you head over to sptfy.com, Login to your account and press "YOUR URL'S" in the menu you will be presented with a list of all the URL's you have created on your account. For each URL you will see a button called "Edit Short Url" next to it. If you press this button you will be able to update the short URL with a new Spotify link if you so wish to.
Please see this image as Reference: https://i.redd.it/7069rlnzx7w21.png