I think that "subject to" reflects well "oggetto di"; also, "appropriarsi" means to "make one's own", therefore "ownership" is a good translation.

However, given that "subject + to" does not translate well "oggetto di", where "di" should be translated with "of", I have introduced "a sense of" precisely to include that preposition. Better still. I would use "feeling" instead of "sense", because "comfort" is FELT more than SENSED, therefore I would say:

"SCARCELY SUBJECT TO FEELINGS OF OWNERSHIP, COMFORT AND WELLBEING".

If you needed the translation to be more literal, then perhaps "feelings of" would have to be cut out and perhaps forget trying to render "object of" in any way other than coming away from that construct altogether.