This would be my recommendation as well. I use one for a 4k video card to go to external monitor. This specific card had people chatting on forums that it didn't work on M-series chips. I'm still on the last Mactel MBP, so it worked fine for me.

In the past, I've run other expanders specifically for SCSI devices mainly JBOD RAID enclosures. ATTO was the brand that we relied on. Couldn't remember the specific HBA though. Too many everything since now and then

At least as of the last major macOS release, that will not work, because the PCIe LSI SCSI HBA driver doesn’t have the extra stuff needed to support external PCIe.

It’d be a pleasant surprise if Apple implemented that for macOS 26 but I wouldn’t hold my breath.