This would still require people to download and run the source code, not to simply download the webpage (what everyone is suggesting to do).
And most of the time it is easier to check C/Java/Python code than javascript. Most websites use tons of JS libraries which makes it almost impossible to check them all.

JS is known to be somewhat risky when dealing with crypto operations.

My way to go would still be to either 1) generate a private key using the linux command line or 2) to use a well-known wallet (e.g. electrum / core).