Can I pray to Allah to remain in Al-A'raf rather than entering paradise, since I am uncomfortable with the thought of my husband receiving fifty thousand hoor, even without any jealousy? I have no desire for any blessings of paradise.
No. Your question seems to reflect very limited side of Paradise and ignore very important facts about Paradise. Paradise does not have materialistic desires only, but more importantly has spiritual happiness and Ridgwan Minallah Akbar ( Pleasure from Allah which is Greater). Paradise is the place of the Prophets and Infallible Imams and people of Pardise enjoy the neighborhood of the Prophets
and the Infallible Imams and have the pleasure of seeing them.
I advise you to read more about Paradise and don't restrict it to what lay people say.
Wassalam.