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Questions &/or issues related to products in the LCDs and OLEDs category should be posted in this forum.
Hi mcnerd,

The OpenLog can absolutely work as an SPI master to a device connected to the ISP header. Just be aware that the OpenLog runs at 5V and the SerLCD runs at 3.3V so you will need to level shift those signals. Otherwise, the OpenLog has the standard Optiboot serial bootloader so you can treat it like an Arduino Uno. I would also recommend verifying the pins you are connecting to on that header by either reviewing the schematic or downloading the Eagle files from the product page.