Alternative LPF and Schmitt Trigger Designs for 350nm IC With Minimal Components

Hello
I am recovering the PWM message signal at the demodulator side of the system. In the attached schematics you can see Low pass filter which filters high frequency, then the signal is fed to Schmitt trigger to retrieve the message signal. I aimed to design the whole system on IC 350nm technology, in which it's preferred to use small size and fewer components. I would like to know:

1) Is there any alternative for LPF, which perform the same job, with a small and fewer component? Especially I am concerned about dealing with a large resistor while implementing LPF on the IC chip.

2) Second, Is there any best alternative to my Schmitt trigger design, with fewer components?

Thanks in advance.