https://munk.org/typecast/2011/04/23/1964-nomda-blue-book-olympia-font-styles/

Typewriter 101: The ULTIMATE TYPEFACE Guide (ft. Typewriter Chicago) by [[Just My Typewriter]]

featuring Typewriter Chicago's Lucas Dul

Not sure if it may help your Typewriter Typefaces Bible project or not, but I'll mention that Marcin Wichary used the Internet Archive to collect a lot of the materials for his massive 3 volume 2023 book "Shift Happens: A Book About Keyboards": https://archive.org/details/wicharytypewriter

In addition to lots of material which he found and collected on the Archive, he added a huge number of resources, catalogs, and books which are either rare or incredibly difficult to find by uploading them to the Archive for others to potentially find and use. You and others may find it valuable and or useful to follow his pattern of uploading and storage there.

syndication link

1954 Smith-Corona (SCM) Typewriter Type Styles and Keyboards Catalog – To Type, Shoot Straight, and Speak the Truth… by [[Theodore Munk]]

Smith-Corona (SCM) Font Styles – To Type, Shoot Straight, and Speak the Truth… by [[Theodore Munk]]

https://munk.org/typecast/?s=fonts

The Story of Vertical Script (AKA: “Script 46 Ra”, “Oxford Script”) – To Type, Shoot Straight, and Speak the Truth… by [[Theodore Munk]]

Replacing the key cap [as a means of switching from QWERTZ to QWERTY] isn't going to help at all, it's just a label. You'd have to swap out internal parts too. Depending on the model, you'd either have to remove and swap typebars or remove the head off the typebar and resolder it onto the appropriate alternate (and ensure that it's properly aligned, not an easy task). Then you'd have to swap the key caps (labels). It's definitely a mechanically doable process, but it's probably almost never done in practice. Doing it as a newbie probably isn't recommendable; you're better off having a repair shop do it for you if you decide to go this route. Depending on the keyboard/model, you'd also have to deal with accents, umlauts, etc.

Given the difficulty (or cost) of the process and the potential end results, you're assuredly better off locating a QWERTY machine and paying a bit more for shipping to your area if necessary.

Your mileage may vary depending on model.

reply to u/imprisoningmymemory at https://www.reddit.com/r/typewriters/comments/1cg1avp/replacing_keys/

Typewriter Typefaces: Pica vs Elite, an explainer https://www.youtube.com/watch?v=qwCD69jUPps

Pica machines (12 characters per inch) will usually have a scale up to about 80-84.

Elite machines (10 characters per inch) will have a scale up to 100.

On Olympia machines, script only comes in Elite sizes (scale to 100 on platen).

https://amsterdamassassin.wordpress.com/2018/12/16/typecast-my-royal-fp-steampunk/