Today I have a classic SharePoint page where the user can enter a number in an input box and press a button to launch a page where this number is appended to the URL of the page. This was a very simple javascript, it was just displaying an input box and the script would just append the number entered by the user so the end result would be like: https://xxx.xxx.com/tfs/Products/MyProduct/_workitems/edit/123456/ and then launch that page.
Now, when I need to migrate this functionality to a modern page, where I cannot use javascript anymore (and SpFx is not allowed on the tenant), I am thinking about different other solutions.
First I thought about creating a list and display only one row (to get an input box where the user could input the number) and then using a calculated field and use json to format an URL with the number that the user could click on to get to the page. But actually I do not want to save a lot of numbers that the users have searched for in a list, and most users do not even have write access to this site. I can arrange write access on this list of course, and clean it often.
Then I came to think about Flow. How about starting a flow after the user entered the number as an item of the list, then building the URL, launching the URL and sending the item straight to the recycle bin? Is this possible in Flow? Will it be fast enough or is flow too slow? Also I do not want to bother the user with mails about this.
Other out-of-the-box suggestions?