Returning to the topic:
// The question is how many deaths are attributable solely to Coronavirus? In order to ascertain the likely effect of the virus on the rest of society it's imperative that we make finding the answer to that question a priority. //
I don't think there will ever be an answer to this that satisfies you, at least not any time soon. Apart from in some very obvious cases, ascertaining a definitive cause of death can be very tricky. Covid-19 is undoubtedly a major contributing factor in the recent massive increase in deaths. Whether that is because it alone is responsible, or because in combination with other conditions it hastens death, may not become clear for years.
There's also an issue of interpretation. If the cause of death is "Covid-19 coupled with chronic heart condition" or some such, then both played their part, and as far as I can see that is enough to say that someone dies "of" Covid-19 (even if there was something else at play), but it may be that you'd see this as dying "with" Covid?
Moreover, even if there ever were an answer it's possible that this would change anyway as the virus potentially mutates to a more infectious or dangerous form. In any case, it's something that I am sure that is being actively researched alongside all of the other questions that the novel virus raises.