All three of your rules (swap blanks, swap single letters, and allow consulting the dictionary) are listed as official alternative rules in my Scrabble rule boo

All three of your rules (swap blanks, swap single letters, and allow consulting the dictionary) are listed as official alternative rules in my Scrabble rule book[0]. We've always allowed use of the dictionary (as a new immigrant from northern Europe, it was one of the ways my grandpa learned English), but we just talked about adopting the letter-swapping rules the next time we play. [0] I have my late grandpa's "deluxe turntable" version from the 1970s, before it was owned by Hasbro, and my folks have an almost identical one from the 1980s (Hasbro-branded). I believe both rule books have these alternative/house rules.