Bumping this thread as it reminded me of an older study titled ‘Acyl and Total Ghrelin Are Suppressed Strongly by Ingested Proteins, Weakly by Lipids, and Biphasically by Carbohydrates’, which also looked at the impact of the three macronutrients on BG and insulin.
Subjects ingested a 500 kcal drink comprising either 80% of CHO, PRO or FAT (with the remaining 20% being made up equally of the other two macros). Bloods were then monitored over a 6-hour period. I have pasted the relevant graphs below:

Plasma glucose levels increased by 60% by 40 min after the carbohydrate beverage, normalizing by 180 min, whereas no glucose elevation occurred after protein or lipid beverages.

Insulin levels peaked at 40 min after each of the drinks. As expected, the greatest insulin increase occurred after carbohydrate consumption, in which levels increased by 764%. The peak after protein consumption was the next largest (391% increase), and lipids induced the smallest increase (183% increase). The effect of protein to increase plasma insulin was sustained until the end of sampling at 6 h, whereas it reached baseline at 240 min after lipids and 260 min after carbohydrates.
These results are useful because (a) it explains why carnivore folks using CGMs usually get something of a flatline BG reading after eating, and (b) it demonstrates that macros like protein AND fat do trigger an insulin response.
Though not my intention, unfortunately, it will likely perpetuate some of the ‘protein phobia’ you encounter in keto crowds. For example, the PSMF referred to earlier (known as the Last Chance diet) was poorly conceived. No wonder folks died. Yet, a PSMF using more optimal sources can be a wonderful diet (IMO).Anyway, hopefully folks find the research posted here a useful reference.