Weird solution (Bad for SEO to start duplicating content and make redirects).
Example: Site with 1% traffic from old version of IE - for this you going to duplicate the entire site! (BIG NO).
https://www.microsoft.com/en-us/windowsforbusiness/end-of-ie-support
Step by Step
No way to know from the start what bugs and problems you find on internet explorer (Maybe "hide section X on explorer its enough).
Traffic
Use google analytics to find how much traffic is from IE (Less than 1% sometimes).
CSS Vendor Prefixes
Webflow use a lot of CSS Vendor Prefixes (Add flexbox support for example)
a way for browser makers to add support for new CSS features before those features are fully supported in all browsers). Read more
JS Detection
By JS it easy to detect the browser anyway (Use webflow custom code) (Google it):