Heimatrecht is basically a way of determining the law under which the will will be interpreted. If your legal system allows this then the answer is yes. You cannot, don't ask me why, choose under which law your will will be interpreted as with practically all other contracts you have two options here or home. I am also very unsure whether you can choose home if you are from two different countries or if you were married here. These are things I would need to check on.

Good news is there are some ways around parts of this... I will write more when I have time which is not in the next two weeks...