Game Bastardization Thoughts

Currently our group is having a lot of fun with 5th edition D&D in vanilla form. 

As always though a person gets to looking around for some fun ways to spice things up a bit. There is just something about character creation that seems lacking and a bit too optimal in my opinion. 

So as we get near to looking for a new adventure for my Wednesday night group which is nearing the end of the Lost Mines of Phandelver module I have been giving thought to running the Tyranny of Dragons (ToD) series, Horde of the Dragon Queen (HotDQ) and Rise of Tiamat (RoT). Having read through it a bit it looks like a fun pair of modules and to be honest I kind of like the low prep, I also run a full sandbox game which is high prep.

So here is my idea for rolling up the new characters:

1. Roll for race. This can be done with 1d10, any races with a sub-race gives the player the option to roll for it as well or play the race as it sits.
2. Roll for class, I am debating this a bit and instead letting them declare class before rolling stats.
3. Stat rolling 3d6 down the line, play what you get. Have toyed with the idea of each player rolling a stat for each other.
4. Incorporating the Hackmaster flaws list with each player having to take one flaw for their character.

We tend to play pretty lighthearted games with humor throughout and I figured it would add a bit different dynamic to the game, but I kind of question if this should be done on a ToD campaign or I should save it for a custom campaign.

Going to run it by my group of course, but if anyone has any input or thoughts on the idea I would appreciate the feedback.