Maybe something like this? It has 6 digits and uses the HT1621 driver:
https://www.ebay.com/itm/332711080391I took a quick look at the HT1621 datasheet, and it looks like you can use SPI.
The ebay seller also states you can use SPI.
Maybe you can ask the ebay seller to take a picture of the pins and silkscreen side?
And give the measurements you need?