OUR story last week about the dramatic rescue at sea of a handsome teddy bear touched reader Kelina Kwan so much that she immediately volunteered to adopt him. Kelina, who teaches music analysis at Hong Kong University, has been collecting bears for more than 25 years. ''Some are collectors' items and antiques, but I also sometimes rescue soft toys from building sites or from dustbins. I like to know that they will be properly looked after,'' she said. The living room in her home has been so taken over by her collection that people sit on the floor, while 200 or so bears hog the sofa. Joint Services spokesman Arthur Murray said: ''We would rather see him go to a good home than suffer the rigours of military discipline.''