"speak extemporaneously" - Translation from English to Arabic

I will therefore speak extemporaneously for much of my statement, and it will not be possible to distribute copies of my text.
ولذلك سيكون معظم بياني مرتجلا، ويتعذر بالتالي تعميم نسخ منه.

I would also like to beg the interpreters' indulgence, as I am going to speak extemporaneously.
كما أود أن ألتمس سعة صدر المترجمين الشفويين، حيث إنني سأرتجل.