The fact no equasions was performed was kind of obvious. It doesn't matter what the number is, we can do it. As for real life costs, it would depend on many factors. Mostly where the facilities are built, if they are built from scratch or recycle a previously secure installation, and what final form the passport takes. Knowing that you could begin to cost up.
No sane nation contracts out their passport production, as letting the materials required to produce these outside of your control is the easiest way to see unautherised copies in circulation. This commonly done in the most secure of conditions - in most places even more secure than their mints. Some share with their mints. It comonly requires materials that feature restrictions on purchase. Regardless, printers, inks, paper featuring watermarks, embossed detailing, holograms etc are easily obtained, and considering the diversity of our populations skill base, easily built from scratch if needs must.
I'm not sure what "interests" you'd be talking about, but potential growth is that of the population. It might not ever end up being any use on Earth, but it's almost certainly required to track citizen migration patterns across infrastructure. Therefore any Asgardian planning to move from where they are born would likely require one. Once we get out of Earth's orbit we will soon cover vast distances indeed. Expirational dates commonly found on Earth passports are likely to be unsuitable for Asgardian uses.
It does take time to build a a new passport template - about a week, maybe two, with the right team sorting it out. This possibly may require two teams, one to work on the digital features, the other to work on the physical. Most of this time is spent testing the product. Both teams will preferably have experience in/of fraud, and therefore be in a position to construct something difficult to replicate, or spoof. First time. Getting hold of IR, UV, or optically variable inks isn't impossible, and pretty simple for the right minded to produce from scratch -=- and it's all printed using pretty standard printer technology(though, cheap low quality home printers are unlikely to produce to high enough quality), commonly available in most homes. What most homes don't have(beyond the inks) is the papers, watermarks, holograms and other security features(these are also not overly difficult to replicate to the determined). I predict the difficult parts being setting up a CSCA and managing CRL.
For folks wishing to learn more of passports, I would suggest IACO document 9303 and technical amendments, and RFC 5280 for some background knowledge on PKI,