This isn't of any use
on the camino, but I have a bed beg suitcase heater that I use when I get home from travel. I've had some run-ins with the bugs in the past and use this as my last line of defense to keep them out of my home.
www.bedbugsupply.com
It's essentially a zippered tent and heater. You slide your entire suitcase and contents into it, turn the device on and wait eight hours. By then everything inside will have been above 122F long enough to kill every bug and egg inside.
I pack anything that can be heated up in ziplocs and put them at the top of my pack so I can easily remove them (medications, laptop, etc). I've put my suitcase through this thing dozens of times and it's held up just fine.
Bed bugs aren't just on the camino, they can be found anywhere from the lowliest pension to the Ritz Carlton.
Not everyone will want to drop $200 on such a device. There's a cheaper alternative that will keep bugs out of your bed and give you early warning are ClimbUp Interceptors:
https://www.insect-interceptor.com/
These are "dishes" you place under the legs of your bedframe and put a little diatomaceous earth in. The DE destroys the bugs' exoskeleton. The device is designed with two wells: a circular well for the leg of the bedframe which is surround by a "donut" well. This lets you know if the bugs are coming from the mattress or heading towards the bed, depending on which well you find them in.
Remember, not everyone reacts to bed bug bites, so just because you didn't find any bites on the camino doesn't mean you aren't carrying them home! Take some precautions before you get home no matter way.
(To be clear I don't mean you should bring that product with you, I'm suggesting it for use when you get home)