I think your current job is actually pretty beneficial because a question I ran into quite often in the interview process was “what is the difference between OT and PT?” Since you work with a lot of PT patients, you will have a pretty good idea on how to answer this question.
That being said, if you’re still looking for another job, I agree with the ideas that a few before me mentioned. While the benefits of a rehab tech job are very obvious, I think that there is a lot of value in getting a seemingly unrelated job and making the connections to OT on your own. For example, I worked at a department store as a sales associate for many years while completing my undergraduate degree. I got this job to earn extra money for books and what not, but I actually gained a lot of insight. I worked in the sleepwear and lingerie department and I had several customers who had breast cancer, shoulder surgeries, stroke, arthritis, and other injuries and conditions. They openly discussed their challenges and we worked together to problem solve ways to get their undergarments more easily. I was able to share techniques with them or suggest undergarments with certain features that might appeal to them (for example, bras with front closure, bras with no fastener to go directly over the head, etc.). Dressing is a great example of an ADL and the challenges many of the customers face are those that our future patients will have as well.
I am not suggesting you should aspire to work as a bra sales person, nor do I think that this should be included in your application as OT related work. However, I know that jobs can be hard to come by, especially those in health care. I think that admissions committees will appreciate your creativity and ability to think outside the box. One of the greatest things about OT is that it is practical field that involves activities of daily life. Transferrable skills are really important (and can be gained in any job if you really think about it), but I think your ability to take it a step further and make direct applications to the field are what makes applicants really stand out. Best wishes in your job search and your application process!!