Yes, for guest pilots the IPPI card is accepted as proof of skill/knowledge.
The Swedish Paragliding Association(SSFF) today requires that its members have at least 5 million SEK liability coverage. (Note the 5 million level will likely be raised to about 10 million SEK in the near future.)
The Swedish Paragliding Association Membership Fee includes a limited medical insurance (invalidity(400 000 SEK), death(40 000 SEK)) and a liability insurance (5 Million SEK).
We can surely address this matter together with our insurance company if this is desirable. (i.e: Offering a liability insurance to guest pilots should be possible, if the need for this is observed).