Since you play online, I don't want to suggest something that could get you banned. You don't need a jig to reset the chip, just something to short the 2 pins while powering on. metal tweezers do the trick. Or a piece of wire, or a paperclip... but you do have to remove the back cover to get at those points.
At your own risk... you could download the firmware files from the web, and update in synand CFW. That should prevent boot0 from being overwritten. As long as you don't run sysmodules or cheats while online, or install an .nsp other than firmware, running cfw on sysnand will actually not get you banned. It's even safe to run an NRO... but careful with installing modified saves for games that go online...
At your own risk... you could download the firmware files from the web, and update in synand CFW. That should prevent boot0 from being overwritten. As long as you don't run sysmodules or cheats while online, or install an .nsp other than firmware, running cfw on sysnand will actually not get you banned. It's even safe to run an NRO... but careful with installing modified saves for games that go online...