I mean its going mach .31, not too fast and i dont think i will have a problem
Except for the part about the proprietary binary format with block acknowledge.
Where abouts on the vehicle do you propose to install it that will not be affected by dynamic pressure effects? The pressure changes you're going to be looking for will be tiny compared to the dynamic pressure at those speeds.
Static ports are perpendicular to the direction of flight, i.e. on the side of the rocket.
There will be some suction there
Does the rocket ever generate any angle of attack?
You seem to be questioning the concept. There are thousands of flights a year that use altimeters based on barometric pressure sensors connected to 8 bit microcontrollers. There are several commercial products available. There are well established techniques for mounting the altimeters and sizing and locating the static ports.
Since this approach is evidently in regular use, I guess that either these effects are not significant at this scale in practice, or there are established ways to avoid them, or perhaps that we're simply not too fussed about the accuracy. Is anyone actually going to care if it triggers at 740' or 760'?
Another option is a GPS sensor.