There's no harm whatever in you,or anyone else, seeking personal insurance for whatever activity takes your fancy. Assuming of course you can find it.
There was however some suggestion that that having a recognised form of "bushcraft insurance" could bring about entitlements and/or recogniction as a "proper hobby". It was also mentioned that paticipants in other "proper hoobies" are compelled to have some form of 3rd party cover. A situation which I distinctly don't wish to see arising.
On the question of precedent, it is to an underwriters advantage to generate precedent, for as long as individuals involved in...lets say, an "extreme sport" (which is probably how they view what we call bushcraft) approach companies seeking specialist policies on an individual basis, the insurance companies, statistically, are probably on a loser. From their point of view, anyone looking for such cover must consider themselves at risk. They are therefor the last people that the company is likely to want to insure. Hence the difficulty in obtaining cover as stands. If significant numbers of applicants come forward, particularly as a group, though, the company may take the view that at least a proportion of these will be inactive within the sport and hence present a lesser risk, so policies may be offered at reasonable rates, so reasonable that it becomes almost silly not to have it, just in case. You may find that companies, other than insurance brokers offer discounts to policy holders, financed by quid pro quo agreements. There may be exclusive events for those holding policies. Landowners and other bodies/individuals may be encouraged through garnishing of their own insurance coverage to offer access only to those insured.
Insurance cover can quickly go from being desirable, to being advatageous, to near mandatory very, very quickly. In the most extreme case it becomes compulsory for certain pursuits. Round about the time it slips from 'advantageous' to 'near mandatory' the premiums can start to work their way up again. And once they start going up, they don't tend to come back down.
Far fetched? Ask a field sports enthusiast of cetain age.