Opticals are not interchangeable with other brands, except Gateron and Outemu, and even if you get a keeb compatible with those, you are stuck with just 8 switches total.

The opticals that I've tried (Gateron, Outemu, Keychron) are really bad compared with cheap mechanicals like Akko, Jwik, Tecsee.

They may last longer, but that just means more years with... bad switches.