Dear Jose Luis,
welcome to the forum, nice to hear about CJ from Spain.
Basically I can imagine to put a filter as proposed by you into the small gas compartment if the CJ. But I have two remarks:
Firstly it requires a number of connectors and elbows and it might be also in the end a bit tricky to change the bottle with all these items in the small space. And the setup must be in line with regulation for gas installations.
On the other hand you may consider your experience with dirt from gas as an exception.
We are using blue Camping gaz bottles since 20 years and did not face such problem so far.
Best regards
Jürgen
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