I agree, these look great. And, yes, I can't find ones like these at amazon, ebay, or aliexpress.
But these here look good:
Smooth silent operation with/without positive click feedback feeling, different optation travel distance, lone life push button switch with operation travel 4.5mm-SHANPU LIMITED COMPANY Co., Ltd. is push button tactile switch manufacturer located in Taiwan since 1975, we focus for LED lighting...
www.shanpu.com.tw
at the bottom, the 34mm x 17mm switch with the flat cover.
But probably you need to purchase a thousand at a time...