I'm practicing indoor with a plastic toy club meant for kids

Okay gents, after hitting the range with a couple of mates earlier in the week, found I had a couple of flaws that I needed to work on. However, at least two of them had been caused by trying to practice indoors (its winter down here right now) - Worried about hitting the ceiling with my irons, I had kind of tried to stop my follow through - Constantly swing and then stopping with the irons had stressed my left elbow a little, and I was trying to compensate with my right arm. I went down to the 2 dollar shop a month ago and brough a plastic kiddy kit, with a little hole for indoor putting (which was the main reason I brought it), as well as a club (too short for me). However, since learning of these issues, I've been using the little toy club to practice my swing, and ... although I think its helped, I just wanted to see you folks through if it could ingrain any bad habits? In particular, the smaller and cheaper plastic mean I can fling the club around, and get that good follow through motion without worrying about dents in the walls. Similarly, the lighter plastic means I can stop any time, and see how the face is aligned during the swing, and there's not anywhere near as much stress on my joints. Obviously, because the toy is meant for 4 or 5yos, its not long enough to actually touch the ground, so I have to concentrate on getting my posture correct. And obviously, its not going to help me with contact or distance or anything like that, but as a method to groove that feeling of flinging forward and being able to stop during swing and see how opened or closed the face is ... it seems useful? Ideally, once the weather warms up, I can practice outside with my clubs, but as an interim measure, what are people's thoughts? Edit - Is there no automatic formatting for line breaks?

I have my oldest daughter's golf clubs that I have bought her over the years, and I'll take one out every now and again to work on positions.  They are real clubs, so they have a good bit of weight to them and they feel "right" as I make various swings.