Good idea mate. They've had war bonds in the past. Why not a Coronabond.? Issue them for maybe fixed terms of 5, 10 and 15 years, offer a decent rate of interest, and make them completely free of all income and capital gains taxes. The latter will encourage the very rich to invest in these things in big numbers, and will make them very marketable on the bond markets too.
There should be some sort of bright idea scheme for Joe Public to make suggestions to the government (keep it clean lads). I'll tell you now that you can't always rely on these highly paid government types to come up with some things that are just so obvious and common sense.
I am imagining the torture of going through the inbox of "bright ideas" from the Public.
It would also be entirely useless.