While snooping around the stock init script, I spotted a variable, home, in the mountdata function standing out from the crowd. After doing some quick tests, the preliminary results are summarised as follows,
Prerequisite: The persistent overlay (.img, .aes or .inf) being on the same partition as the KNOPPIX file.
Functionality: Loading a specific persistent overlay at the boot time.
Usage: knoppix home=/mnt-system/foobar/dummy
*The dirname and basename cannot contain any whitespace characters.
*The basename needs to be unique if there are more than one overlay files in the same folder because the suffix cannot be part of the argument.
A-Tech 8GB DDR3 1600 PC3-12800 Laptop SODIMM 204-Pin Memory RAM PC3L DDR3L 1x 8G
$13.99
Samsung 16GB 2Rx4 PC4-2133P DDR4-17000 1.2V RDIMM ECC Registered Server Memory
$16.29
HyperX FURY DDR3 8GB 16GB 32GB 1600 MHz PC3-12800 Desktop RAM Memory DIMM 240pin
$12.90
Samsung 8 GB PC4-17000 DDR4-2133 1Rx8 DDR4 Desktop Memory HP P/N 798034-001
$10.00
A-Tech 16GB 2 x 8GB PC3-12800 Laptop SODIMM DDR3 1600 Memory RAM PC3L 16G DDR3L
$27.98
A-Tech 8GB PC3-12800 Desktop DDR3 1600 MHz Non ECC 240-Pin DIMM Memory RAM 1x 8G
$13.99
Kingston HyperX FURY DDR3 8GB 16GB 32G 1600 1866 1333 Desktop Memory RAM DIMM
$13.25
32GB (4X8GB) DDR3 PC3-12800 1600 NON ECC LOW DENSITY MEMORY F3-12800CL10Q-32GBXL
$32.00
A-Tech 256GB 4x 64GB 4Rx4 PC4-19200 ECC Load Reduced LRDIMM Server Memory RAM
$287.96
A-Tech 64GB 4x 16GB 2Rx4 PC4-17000R DDR4 2133MHz ECC REG RDIMM Server Memory RAM
$87.96