Grind coffee with a blade grinder for a moka pot?
Yes, you can, as long as it's a decent quality blade grinder.  It's how I fill my moka pot, which I've been using 5 days a week for the last 4 years.

You can't do actual espresso in a blade grinder (it's not possible to get the grind consistent and fine enough).  But moka pots are a lot more flexible in the grind of coffee that they will accept.  Just grind it almost as fine as you can -- this takes about 30-40 seconds of grinding in mine -- and put it in the basket.