It's true almost all devices doesn't include DVD player. But there are some company make and sell external DVD reader. Amazon even claim one of the DVD reader sold over 1 thousand in past month.
I can also find a bunch of sellers on Amazon selling VCR and VHS players, but that doesn't mean it's good idea to use VHS tapes and expect them to keep your videos safe in future.
And with strong enough magnets you can easily destroy any information stored on CD, DVD and hard drives.
Few months later, Sony decide to stop production of CD, DVD and BD[1]. If it leads to other company stop producing the drive reader, your statement would be more accurate.
Well, the OP can still make a tails OS USB and create a cold storage on a tails USB and if he manages to set it up correctly, then it would be a cheaper solution and a reliable one too.
Details can be found here
How to Install Tails OS on USB flash drive for Wallet PurposeHowever, as the OP is thinking of having a complete blockchain on his pen drive or storing his wallet directly on a USB drive, such a solution doesn't exist and/or isn't feasible/secure.
OP probably use chatbot, so i doubt he'll try any suggestion mentioned by you or other member on this thread.
[1]
https://www.azernews.az/region/228058.html