Jana --
Most of us do understand that many caregivers don't have unlimited resources and we have to work to pay for insulin, strips, etc. My situation wasn't all that different other than I had a short commute and I had some degree of control over my schedule. If I was worried, I could run home at lunch and test Gabby. When I moved to a new job in a different city, I would often run home at shot time (5:00) and go back to the office for a late meeting. We all make the accommodations we need to make.
One thing to be aware of is that many vets, at least here in the US, will advise caregivers to leave their cats in higher numbers than we like. Often, they will indicate that the numbers are fine as long as they are in the 200s. The problem is that this can be a range that's over renal threshold. Diabetes is hard on the kidneys and allowing a cat's numbers to stay above around 220 increases the risk for kidney disease. If your goal is regulation or remission, you want to see numbers that are in normal range (50 - 120).
I'd suggest getting a test at around +11. It will give you an idea of where numbers are heading at shot time. However, Mumf's dose should be reduced based on the 43. With SLGS, you reduce the dose by 0.25u when numbers are below 90.