Alps Blues aren't made anymore? That's a bummer. I thought I saw they made Clears and that those were close to Blues.
My RSI is unrelated to the keys. I've used dozens of keyboards over the past decades, including several ergonomic keyboards with really squishy keys. What helped most was a combination of switching to Dvorak - a decade before Colemak was even a gleam in Shai's eye; switching to a split keyboard, the Microsoft ergonomic split was the first one, and I used versions of it for years before Microsoft utterly ruined the perfectly good design they'd acquired; and most recently switching to column stagger, which took care of the last persistent pinky pain. I've used Kinesis Freestyles at work and home - exceedingly squishy, utterly no tactile, and super inaccurate for my typing style. I had an ErgoDox for years, which I thought was also low on the tactile even if it was noisy. I only recently got a truly mechanical keyboard - custom built by Beekeeb because I'm a hazard with a soldering iron, and I chose the most tactile Chocs available, and they're not even a tactile as the ErgoDox.
Thinking back, I can say I guarantee my RSI isn't related to tactile switches because I don't think I've ever owned anything I'd consider tactile, since the Model M. Clicky, yes; tactile? Barely.
My issue is that I can't justify buying a bunch of different keyboards with different switches to try to find the right switch; and I honestly am really bad at soldering. Like, disastrously, expensively bad. Maybe I could buy a variety bag of switches and find one based on a 1-finger test, but I know from experience that that's no substitute for time on a full keyboard, and can indeed be very misleading.
The MX plug & play route might work, if I can find a keyboard with the right layout. My hands are large, and I can span a full octave on the piano, and I've found a split with aggressive column stagger is the most natural resting position for my hands. I'm hobbled by how specific the particulars are.
The Piantor Pro I currently have is the right layout. If I can find something like it with MX, I could try some other switches.