Dimitri,
You do not need any adaptor to connect to this valve so the point 1 is irrelevant. As long as you have a pump with a hose you can inflate it. And I don't think the point 2 is a good one, you should make a survey about that but less is better so if you have one great valve that can inflate/deflate you should not keep an other one that will never be used and is a source of eventual problem. That is just my personal opinion, try to do a survey about the need for the second old type valve.