Dr. B suggests a long needle. I rarely correct and just use my 5/16 (8mm) needles. My experience is that IM injections act fast, noticibly faster than subcutaneous injections. However, I don't have experience with extreme highs (I am T2) and one must be prudent to not overcorrect. And I think Dr. B believes that IM injections are appropriate for correction all the time by everyone.
Yes, I do use the Nova-Max ketone strips. I received a free kit with two ketone strips which I've used up. I also had another blood ketone system that I've used in the past. I rarely need to test for ketones and I haven't tested above the published threshold. I think it's a good thing to have on hand, however, and I need to get a prescription for more strips.
Sorry, I can't give you a comparison to the urine strips as I've only used those a few times early in my diabetic life and the event was unremarkable. Perhaps your "yes or no" value is all you need. I do think it's easier to prick a finger for a blood sample than it is testing urine.