WiFi design is not small. Lots of signal processing, low level MAC state machine, etc. The core part is in order of 20K LUT. Then we also need interface (ADC/DAC), DMA/USB, etc.

https://www.mouser.com/ProductDetail/Lattice/LFE5U-85F-8MG285C?qs=Rp3RbKSfAt0W9nx6h7f32g%3D%3D Maybe this might meet the spec for WiFi design? - $30 at qty 1, 85K LUT4, 3.8MBit BRAM, lots of I/O... they have a version w/ SERDES as well