I'm trying to parse:
First we determine how much money we want for our bounties and which bounties we want to provide
Then we auction the bonds. We let people bid on the amount of XMR they want to receive per mBTC they lock for a year
We use the forum funding system to crowdfund the interest after a year.
A perhaps simpler solution would be to just have the bonds / bounties expire annually and require re-activation. So this way, the funds aren't locked up forever and there is an annual adjustment based on the current fiat value.
So, imagine a 10,000 USD fund for exploit X. 10 individuals "put their money where their mouth is" regarding their faith in the Monero code and the core team and put in 2k XMR each (using current fiat value of 50 cents).
A year goes by and the bounty is unclaimed. The 10 individuals who supported this have their XMR returned to them. They then have the choice to cycle another year at 10k. Presumably, monero is now at 1$, so they put up 1k XMR each.
While there's no blatant incentive to put your money up, it does do one thing: prevent you from selling your monero.