I don’t think those of us who are commenting are being “negative” but rather just relaying our own experiences (which, yeah, with few exceptions were not great).
If I were doing this experiment, I would hope for the best but prepare for the worst. If getting a good basal/baseline dose were as simple as splitting NPH into 4-6 injections a day, I think more people would be doing that (or would have in the past). The fact that they didn’t and don’t might mean that it won’t actually work as well as you hope, in which case you’ll have to fall back on something like what most of us used decades ago. (Which, yeah, may not be a big deal when you’re doing an experiemnt that you can start and stop at will and when you have modern technology at hand, but was a big deal for many of us who used it as children/adolescents/young adults and had no choice in the matter.)