Yes. just keep all the keys from Row 1 in one bag, from Row 2 in another bag, etc.
I think you would like MX reds, but you might not feel that much of a difference. If you ever decide to try and change how you type, i.e. not bottoming out, you will probably find the browns helpful, though. I thought I would always bottom out, but I'm getting better at not doing it now.
I would go with 40A hardness O-rings. You can try 50A, but they won't dampen the sound as much. Make sure I.D. is 3/16". O.D. should be no larger than 5/16".
Hope this helps.