Hello Mark, I`m glad to hear about your appreciation. I think you can follow the second one you pointed.
There` s not reason about the first one. You must use all forum and all boards as much as you can enjoy it. You are
and all international users all
in all forum.
The international section is only if you want share something in your language, like a tutorials for example.
If you want reply to a post please feel free to use your native language.
If you write in english we can use even the google translate toolbars to retranslate in Italian(if we do not understand),I do not think also is too distracting to the italian readers. We can learn each other from the post and discussion and also we can improve our skills and knowledge in languages and inkscape of course ;)
Anyway you need to feel confortable with yourself, if you think the third point
(3) Reply in English but also provide a Google translation into Italian)is suitable to you go ahead.
For my point of view the second
2) Reply in my native language (English)
is the best.
We are not at school and if we can make few mistakes with english or italian grammars is not important. The important is sharing our competence and draw freely ;D