Did I miss the timewarp where we jumped back 30 years?
PIC solutions have been about for almost 20 years, with a VERY old application note that used an OTP PIC and seven segment displays. It was later (still last century) ported to more 'modern' devices and an LCD display - check it out here:
Notice the input stage, a frequency counter isn't a scope, so you don't need (or want) a linear input - you want to clip it and convert it to a square wave. The PIC example (running at a low frequency) makes an auto-ranging 0-50MHz counter with only two chips.