If you ever want to add a phone number and a website, there is a way to do it while still being fairly minimal.
An IPv4 address is a 32-bit unsigned integer. It is commonly written in the form x.y.z.w, where x, y, z, and w are all unsigned octets. E.g., HN's IP is 3520653040, which in x.y.z.w form 209.216.230.240.
Most common IP parses accept the 32-bit integer form. E.g.,
$ ping 3520653040
PING 3520653040 (209.216.230.240): 56 data bytes
64 bytes from 209.216.230.240: icmp_seq=0 ttl=50 time=41.239 ms
IP addresses can also be written in x.y.z form, where x and y are unsigned octets and z is a 16-bit unsigned integer, and in x.y form where x is an unsigned octet and y is a 24-bit unsigned integer.
HN's IP written in those forms is 209.216.59120 and 209.14214896. Those forms are also accepted by most common IP parsers. Browse to http://209.216.59120 or http://209.14214896 and you end up at HN.
In many countries, including the US, telephone numbers are written as 3 unsigned integers, x, y, and z. There are usually a variety of ways to format those such as (x) y-z or x-y-z or x y z or x.y.z.
It should be possible to get a phone number x y z where x and y are both less than 255 and where the IP address x.y.z is also valid. Obtain that IP address and put an HTTP (not HTTPS) server there (which can just redirect to your name-based HTTPS site), and then you can add to your business card
Phone and Web: x.y.z