Update.
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setparams 'Install'
set background_color=black
linux /install.amd/vmlinuz vga=788 --- install disk-detect/multipath/enable=true quiet
initrd /install.amd/initrd.gz
provides the `multipath` command, but nothing is detected, seemingly because multipath.conf+tools+module are missing?
I've finally settled on the following to get it working...
Install debian to lvm on single "disk", and after install dropping to shell before rebooting, and forcing lvm to ignore the others paths (disks) so I avoid duplicate PV warnings and activating the volume group.
Then mounting and chrooting into the installation, and installing multipath-tools+boot, and editing lvm.conf + multipath.conf as needed and adding dm_multipath to initramfs-tools/modules and dist-detect... to the grub conf cmdline.
Run update-initramfs -u and update-grub, and that gives me a working debian install that boots from multipath FC san.
I am sure there is a simpler way, but this seems to work.