Alternative content for embedded timeline iframe


We are using a widget to embed a timeline to our home page. Our site has been tested for accessibility and we have been requested to add some alternative iframe content for browsers not supporting iframes. I am reluctant to host a local copy of and then change this. Is it possible that this could be added as a configurable option? Our current widget code looks references:

Tweets by @BracknellForest

Many thanks in advance.