Is it okay to use stative verbs in Topic-Comment?
In a 'topic-comment structure', the topic and the comment cannot swap places. If they can, the sentence would not be a topic-comment structure. It is just a 'object placed before verb' sentence

Examples


  這個人(object) 我喜歡 (subject + verb) [O] 
  
  我喜歡(subject + verb) 這個人 (object) [O]
  
  這個人 (topic)  不是好人 (comment) [O]
  
  不是好人(comment) 這個人(topic) [X]


More examples:


  我去过(subject + V) 中国 (object) [O]
  
  中国 (object) 我去过(subject + V) [O]
  
  攻擊中國 (topic) 對美國沒有好處 (comment) [O]
  
  對美國沒有好處 (comment) 攻擊中國 (topic) [X]


Now look at your other examples:


  我需要買(subject +v) 汽車(object) [O]
  
  汽車(object) 我需要買(subject +v) [O]
  
  她奶奶(object)  我很想念(subject + verb)[O]
  
  我很想念(subject + verb) 她奶奶(object) [O]


None of the above is 'topic-comment' sentences

Example of stative verbs in comment


  攻擊中國 (topic) 大家都[覺得]對美國沒有好處 (comment)
  
  美國攻擊中國 (topic) 我[希望]只是一個謠言 (comment)