MashieNiblick
Tour Winner
Likewise, you are permitted to take your stance, so any info from that is allowed -though I believe that's the reason you are not allowed to change your club after you have done so.
Did you mean the "not"?
Decision 13-4/26 Taking Stance in Bunker and Then Changing Clubs confirms that you can change clubs after traking your stance.
"Rule 13-3 allows a player to place his feet firmly in taking his stance in a bunker or elsewhere. There is nothing in the Rules to prohibit changing clubs or taking a stance twice in a bunker."
I have done this many times, especially from fairway bunkers when I suddenly realise I'm not Seve, and I put the 3 wood back and take the 9 iron.

In relation to raking the bunker after playing from it but before dropping back in it, I confess I wasn't too sure on this but checking it out it is quite correct that this is allowed. Decision 13-4/37 Ball Played from Bunker Is Out of Bounds or Lost; Player Tests Condition of Bunker or Smooths Footprints Before Dropping Another Ball in Bunker, confirms that it isn't against the Rules to do this;
"The prohibitions in Rule 13-4 apply only when the player's ball is in the hazard or when it has been lifted from a hazard and may be dropped or placed in the hazard. In this case, the player's ball has been played from the hazard rather than lifted.
Furthermore, Exception 2 under Rule 13-4 allows a player, after playing his ball out of a hazard, to smooth sand or soil in the hazard without restriction. This right overrides any conflicting provisions in other Rules, including Rule 13-2."
The key distinction is between whether the ball has been lifted (no raking allowed) or played (raking allowed).
Makes sense as you might play from the bunker and rake it and only discover later that your ball is lost or OOB so you have to drop back in the bunker. An additional penalty at that point for having done the right thing and raked the bunker after playing the ball would not really be justified.
And in response to the OP. Yes it would be nice if bunkers were consistent and to that extent in fairness they should be. I'm sure they are for the Tour guys. All that lovely crushed marble they play from. No wonder they are so good. But the fact is at our level they mostly aren't and we have to just accept and get on with it. Same with inconsistent greens and patchy fairways. We are only playing for fun after all.