You are doing great to start preparing to test even before insulin comes, hope the procedure gets easier very quickly for you two
I guess what
@Sienne and Gabby (GA) is saying is that nobody here has found it to be of need, majority of people on the forum use human glucometer (cheaper stripes and all dosing methods have been developed based on human glucometers).
Just FYI if you will be testing at home there is no need to take the cat for a curve in the vets office, the glucose levels there will tend to be higher due to stress

most of us on the forum do not consult dosing with our vets, in our case it became clear very quickly that he had no clue in dosing methods so thank God we found this forum
I noticed you intend to use TR dosing method, i believe it is a very good choice since it will give you the highest chance of remission nonetheless due to the fact that it is more aggressive the kitty should be on an exclusively wet low carb diet in order to be able to follow it safely. Have you tried to switch Black to wet low carb diet? There are techniques to help you with it. We were lucky enough that Chico was more than happy to switch to a fully wet diet but my sister successfully switched her “only kibble” kitty to wet food with the help of this article:
https://www.ibdkitties.net/switching-foods/
good luck and plenty of patience, FD requires a lot of patience