Not being entirely cute, but perhaps the visibility of the various devices will allow you to stay under Tier 1 or 2 and easy enough then to average the overall cost per kwh. the purpose of the tier is to discourage high usage of course.
The one thing regardless that Sense doesn’t do is put on non-kwh based charges, often called facility, customer, or service charge. Those charges are to pay for fixed costs of administration and distribution, costs which are incurred by the utility regardless of kwh consumed. I’m sure your bill is more complicated than mine with lots of extraneous surcharges.
Personally, I’d rather Sense work on better device detection and allow self-identifying detection. They do ambitious goals.