I think you might get part of the way but may still find you get detected. Foss DPI projects will not be able to implement the methods used by say fortinet,sonicwall, f5, juniper, Cisco, a10, and others. This is because they all use proprietary DPI created in house. They’re not going to use Foss DPI for obvious reasons, you’ll be able to create workarounds for detection and implement that in a bad payload.