[jacobolus]

You can definitely type without injury on a standard keyboard if you place it relatively low, tilt it to a comfortable angle (the best tilt depends on the height of the table), and bring it in close to your body, especially if you are only typing some of the time. (That is, if you are a writer or programmer rather than a professional transcriptionist or data entry clerk.)

However, having your wrists be less pronated also makes a huge difference. The most neutral position for your forearms/wrists when your arms are in a typical typing position is only pronated slightly compared to a vertical (“handshake”) type orientation. Typing on a standard one-piece keyboard, such that the palms are facing downward, even in the best possible position, still puts a lot of static load on the relevant muscles, and encourages the typist to hold the arms out to the side with the elbows up, as a way of reducing that strain, which causes various other posture problems.