SerialDev2232 was developed as a stand-alone prototype board that has the same features as the Lattice MachXO2 / MachXO3 breakout boards. Check out my XO345 project to see what can be accomplished with a miniature MachXO3 device hooked up to JTAG and 4-wire SPI lines of the FT2232H.
That at least was my test rig to develop a sort of ASIC hybrid that replaces another USB interface chip and implements a Slave SPI peripheral. This new peripheral is hooked up to the FT2232 expressing a 4-wire Master SPI. (Further reading: Lattice RD1125).
However I'm always interested in new sensors and peripherals and I'm increasingly uncomfortable with test jigs that lose wires and parts during transport or have patch cables ripped out by accident.
The SerialDev2232 should be in a price range where you'd just buy one and build your sensor evaluation setup, hook it up to a Raspberry Pi, Windows PC or laptop and dive into register maps and buffers of the peripheral.
I've made excessive use of COMSPI (see links) during development of a Slave SPI device on a MachXO2-7000 and MachXO3L-1300.
Besides SPI the default interface is UART (VCP) but you can also have I2C on the LibMPSSE-I2C level.