You might try exporting the drawings to autocad without the border, and placing their autocad border in that drawing, this way it will retain its original format. pain in the **** yes, but until people realize Inventor is the only way to go, we must babyset them
You can directly save an idw to a dwg in Inventor without exporting and it will open in autocad. The problem is that things will not be directly editible or searchable.
To answer your question about searches, yes, inventor uses those same attributes in vault to keep track of drawings and files. But these are lost in the conversion process from idw to dwg. If they had Inventor they would be able to search any of their autocad drawings or inventor drawings through vault, by any attribute. If they do not want to upgrade to Inventor, then the pain in the a... solution is the only one for now. They will simply have to replace the title block, or your company needs to purchase the suite which includes autocad as well, or at least one license so someone can put the borders on the dwg's and retain the attributes. Really about the only solutions right now until inventor saves all the attributes as well.
Saving the .IDW drawings directly as Inventor .DWG drawings may be a workable solution however it appears that the drawing border shifts when we do this, so the border is not centered on the sheet anymore.
Try doing like we do. We made a template, saved that as a dwg for Inventor, and use that template when we save to dwg.
But I doubt it as we made the borders in inventor, but if you do a lot of business with this company you might consider taking the time to remake that border in Inventor.
Could you makle a border in Inventor, and just import the title block part of the autocad into the title block folder, without the border? This may prevent it from shifting.