I guess so, if you trust yourself or the welder that the "button" can get loose. I do have concern about cleaning the cheap grade of cast aluminium for a stellar tig/heliarc process. The less potential parts that can come apart the better in my opinion.
You could also get the updated case that has the "blocker" that would prevent pin fall out.
Since the case will come off anyway, what not "jig it. " With it off the engine, I would think you could measure, mark and eyeball close enough to stake the hole, even without the special jig.
The longer housing bolt and cummins tab is an option too. I think Joe George will send you his instructions on how to home fabricate a tab or maybe he even sells them, not sure.
Good luck
Andy