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.
Lenovo IdeaPad 5i Slim 5 16IRL8 16" (512GB SSD, Intel Core i5-1335U, 1.30GHz,...
$469.00
Lenovo 100e Chromebook Laptop 2nd Gen | 11.6" HD | MTK 1.7GHz | 4GB RAM | 32GB
$32.00
~OVERSTOCK~ 15.6" Lenovo ThinkPad Laptop: 8GB RAM 512 GB SSD Windows 10
$179.99
Lenovo - LOQ 15.6" Gaming Laptop FHD - Intel Core i5-13420H with 8GB Memory -...
$629.99
Lenovo ThinkPad Yoga 11e 11.6" 2in1 Touch Intel Core i3 4GB RAM 128GB SSD Win10
$59.00
Lenovo ThinkPad X1 Nano 13" Touchscreen 2K i7-1180G7 16GB/256GB Win 10 Pro
$599.69
Lenovo 81ES0007US 11.6" 500e Touch Chromebook w/Celeron 1.1GHz/4GB/32GB - Used
$39.00
~Built in CD/DVD~ 15.6" Lenovo ThinkPad Laptop PC: Intel i7 16GB RAM 512GB SSD
$214.95
Lenovo Legion 5 Gen 7 AMD Laptop, 15.6 FHD 165Hz, Ryzen 7 6800H , RTX 3070 Ti
$924.99
Notebook Lenovo Slim Pro 9 Laptop, 16" Glass, i9-13905H, GB, 1TB SSD
$1051.99