I am from Australia, Amazing posts too.
I have seen an awesome YouTube site in Auss a guy has done a similar setup using the fortin unit with some other items which I went with in the end. Our Jeeps in Australia come with steering locks so you need to have a spare key (cut down) and a cap to cover the ignition barrel. the barrel wires are disconnected so no dramas there, key is purely to release the steering lock mechanism
but liked your post and also the advanced keys product. https://advancedkeys.com/products.htm looks like it’s all well packaged with the credit card style emergency access. however, it’s pretty pricey but they look like they have all the bases covered.