Adafruit FT232H Breakout - General Purpose USB to GPIO, SPI, I2C [USB C & Stemma QT] : ID 2264 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
CH341A Programmer USB to UART IIC SPI I2C Convertor Parallel Port Converter Onboard Operating Indicator Lamp Board Module: Amazon.com: Industrial & Scientific
MIKROE-1204 MikroElektronika | Development Boards, Kits, Programmers | DigiKey
FT4222HQ - FTDI
SPI Multiplexing IC" and "USB-SPI Bridge IC" recommended - Switches & multiplexers forum - Switches & multiplexers - TI E2E support forums