It would be confusing, I mean would you say 'This is Dr Captn Notelling' or 'Captn Dr Notelling'
Seriously though, I don't think it makes much difference. At RR you might be earning a bit more than on a doctorate, but then again you may be just another graduate amongst many. The PhD could be an interesting and fun time, and is very well respected, and you could still work at RR afterwards if it's relevant.
No-one really uses Dr. in their name in commercial land anyway - there are plenty in my company, and they seem to keep a low profile - it won't prejudice you.
Judge it by its value to you, rather than what others will think.