Pixfalcon GPS compatibility

Is it possible to use other GPS modules instead of u-blox M8P ?
The purpose is to get a simple GPS connection, is does not matter how precise it is.

Those in my local store are this:
GY-GPS6MV2
GP-735

“PX4 currently only supports the single-frequency (L1) u-blox M8P based GNSS receivers for RTK.” : Dev Guide

Thanks.