best way would be to relist the asset on some other exchange, pay the dividends that were not paid and then let it trade for a couple of months and buy back the bonds as per contract if you wish. You may also execute the buyback following the last trading data from GLBSE (should be found somewhere on these forums).
In all honesty re-listing sounds like a lot of work for miniscule return.
For perspective; I own around half of the 800 bonds, the next largest holding is one quarter and the majority of the rest are single digit amounts (several, like my itchy trigger fingered friend strello, hold one (1) single bond).
My feeling is that 1MH/s bonds are worth somewhere south of 0.05btc, based on the markets decline towards the end of GLBSE and diminishing returns from mining including the looming ASICpocalypse.
Seeking opinions and evidence of similar bonds trading on the new platforms.
Depends on how many bondholders you had. If you don't list somewhere, you have to process the last two months of dividends & buyback manually. Not a big deal if there aren't many, but can be a PITA if you have a lot.