Now, I know <р> (letter "er") to be pronounced [r], however, I never have been able to do an alveolar trill. So, my question is simply: would it be acceptable to use a uvular trill [ʀ]? It was only within this past week that I learned how to even do that! And my skill in doing the uvular trill is still a bit shaky, to say the least. So, I can't imagine being able to succeed in doing the (what I believe to be the more common) alveolar trill any time soon - if ever.