Using Differential Amplifier to reduce required RC values
Here is a GIC-based lowpass (2nd order):
Design equations:
$$A_o=1 + \frac{R_5}{R_6}$$
$$wp=\sqrt{\frac{R_6}{R_1 R_3 R_5 C_2 C_4}}$$  with \$wp=wc\$ for Butterworth response.
$$Q_p=\frac{R2}{\sqrt{\dfrac{R_1 R_3 C_4}{C_2}}}$$  with \$Q_p=0.7071\$ for Butterworth response.
For desired R values you have enough freedom to &quot;play&quot; with.