I don't think the issue is controlled inflation. I think the fear is of rapid inflation caused by governments struggling to make interest payments, which could cause the value of any cash or bond positions you have to effectively go to 0.
Similar reason people find gold appealing I suppose.
Intentional debasement is one way of getting out of very serious national financial problems. It is unpleasant, but it's chosen (or, more likely, can't be prevented) because the alternatives are worse. If you make this option impossible for your government, you're setting up your country for some very bad consequences the next time in some economic disaster it would have needed to have that rapid inflation, but can't have it.
Hyperinflation is a symptom of economic problems, not the origin of it. If you find a way to prevent nominal inflation by crypto, it doesn't prevent the related problems. There's a good reason why we got rid of the gold standard, which had all the same problems as a crypto-based economy would have, and was unsustainable because of that.
Since you mention bond positions, if they'd were denominated in non-inflationary crypto, in any such scenario they'd drop anyway - if it wouldn't be possible by inflation, then it'd happen by defaults. Which would also mean a default of all credit institutions. Which would then mean the disruption of most businesses who rely on these institution. Which would then mean nonpayment of salaries. Which would then cause a lack of demand, causing even more economic problems. Compared to that, a semi-orderly inflation (up to the extent that is required) is preferable to a cascade of defaults. The vast majority of the money in economy is anyway in the "I owe you" form, and crypto doesn't change that; even if all the economy would move to a cryptocurrency, only something like 2-5% of it could be in the form of "hard coin that I control" and the rest of it is in debt relationships between various businesses.
It sucks to get paid in some paper that's now nearly worthless - however, the alternative isn't to get paid in hard crypto, in such a scenario the possibility to get paid in full doesn't exist. So if we don't have the possibility to get paid in a devaluated currency, then people either don't get paid at all, or have to suddenly invent a new worthless paper currency and build an infrastructure for it, at a time when they don't really have the time and resources to do it. This isn't a hypothetical example - such "currencies" have developed in e.g. various long-term conflict zones.
you can create a crypto with some pre-set amount of inflation to make up for e.g. lost coins. or create inflating derivative securities. though, having inflation in a single globalized market doesn't make much sense, as there are no competing economies.
