Microsoft Edge Legacy side by side experience no longer possible on Windows 10 2009

I am a web developer and I have been running Edge Legacy and Edge Chromium side-by-side so that I can test our clients' websites in both browsers, because not all of the users of those websites will have updated Windows 10 far enough that Edge Chromium will have been installed on their machines.

But after a recent Windows 10 update the Edge Legacy icon has disappeared from the Applications folder (enter shell:appsfolder in the Run dialog to navigate directly there), which was the only location from which I could reliably launch Edge Legacy in the past. (Because any shortcuts I made to Edge Legacy would inevitably be overwritten as shortcuts to Edge Chromium.)

This is very frustrating because I have to be able to use both browsers. They have entirely different rendering and JavaScript engines, EdgeHTML and Blink/V8, respectively. And it's also pointless for me to test sites in Edge Chromium anyway because that testing is redundant with the testing we're already doing in Google Chrome.

I'm almost at the point where I'm going to try to forcibly remove Edge Chromium.