http://www.mechanicalkeyboards.com/shop/index.php?l=product_...
https://www.ebay.com/itm/Gateron-Clear-switch-3-pin-for-mech...
https://mechanicalkeyboards.com/shop/index.php?l=product_det...
I'm a fast typist (around 130wpm) and use these switches just to try to improve speed, rather than anything relating to health. They're also great for gaming for me, playing Starcraft 2.
Another option around 35g is non-mechanical electro capacitive switches in the style of Topre, e.g. https://www.nizkeyboard.com/product/plum-84-ec-mechanical-ke...
https://www.kinesis-ergo.com/partners/health-safety/ergonomi...
So if you aren't ready to take the "crazy layout" plunge but want low force switches, MX Reds are really light and really linear.
You can even go further and try Cherry Silvers, I believe they are essentially the same (same spring weight, same linear stem) but the actuate at 1mm instead of 2mm (most cherry switches have 4mm of total travel).