The Debian-Live approach also provides some good opportunities. First and foremost, the very easy remastering makes it efficient to run with no persistent store quite often. For instance, upon remastering, I just start without the store, and the image I run is union-mounted with the persistence file and copied&compressed. Then I have to boot something else to copy the new squashfs image in place, but that's all that has to be done outside the system.
Boot the new image without persistence, create a new persistence file.
For further adaptations, the new persistence file can be mounted in an instance run under kvm, programs can be added and settings tweaked for an eventual new remastering.
Storing the series of squashfs-compressed images, one can always go back in this process if needed.
Juniper Networks EX3300 EX3300-48P 48-Port Gigabit PoE+ Switch
$37.41
Juniper Networks EX3300 EX3300-48P PoE+ 48-Port 4x SFP Gigabyte Ethernet Switch
$59.99
Juniper EX3300-48P 48-Port 10/100/1000BASE-T (48 PoE+ ports) with 4 SFP+
$74.00
JUNIPER EX3400-48P 48x 1GB PoE+ RJ-45 4x 10GB SFP+ 2x 40GB QSFP+, DUAL AC POWER
$168.00
Juniper EX4200-48PX 48-PORT 10/100/1000BASET PoE Ethernet Switch
$50.00
Juniper Networks EX2300-C-12T Compact 12-Port EX2300-C Series Ethernet Switch
$300.00
Juniper 48-Port GbE 8-Port PoE & 4-Port SFP Managed Network Switch EX4200-48T
$31.19
Juniper SRX320 8-Port Security Services Gateway Appliance w/ Rack Ears
$99.97
Juniper EX 4300 EX4300-48P Gigabit Network Switch JunOS 21.4R3-S7 48 Port PoE
$249.00
Juniper Networks SRX100 Services Security Appliance Part Number: SRX100H2
$22.50