Is there a resource to look up widely in-use/standard connector styles?
D-sub connectors with more than 50 pins were never standard, and ones with more than 25 pins were never common. I don't think a d-sub connector is the right choice for this purpose.
If you don't need anything special in terms of signal integrity or current carrying capacity, I would recommend a simple pin header, such as this one; 0.1&quot; rectangular pin arrays aren't going to go away any time soon, and for cables, you can get IDC connectors that just clip straight onto a ribbon cable without even needing to strip or solder anything.
The IDC connectors may become harder to find in future, as they're less popular now than they used to be, especially in such large sizes, but other types of header that will still fit the pins will likely remain available for decades to come.