Flying to LKPR comes with ~200€ bill, plus the airport is co-ordinated, so you need a slot for arrival and departure - this basically kills most light aircraft at the beginning.
Considering P-RNAV, you can always say that you are "unable (P)RNAV", but I believe it is up to ATC whether they will permit you depart or arrive via radar vectors.
Extracts from Czech Republic AIP AD LKPR:
2.22.3.2.3 RNAV procedures
2.22.3.2.3.1 P-RNAV certification is required for RNAV arrival
routes.
2.22.3.2.3.2 Aircraft not certified for P-RNAV can also utilize
STARs with certification for B-RNAV. Aircraft not certified for
RNAV may incur delays and/or extended routing during peak
periods.
2.22.3.2.3.3 Only a pilot-in-command of an aircraft not
certified for B-RNAV shall inform the ATC when establishing
the first radio contact.
2.22.3.2.3.4 For aircraft not approved for RNAV operations,
necessary number of conventional procedures or vectoring
will be provided.
2.22.3.3.9 RNAV procedures
2.22.3.3.9.1 P-RNAV certification is required for RNAV
departure routes. Separation on parallel departure routes (for
example RNAV SID from RWY 24 to the north) is provided by
ATC service.
2.22.3.3.9.2 Aircraft not certified for P-RNAV can also utilize
SIDs with certification for B-RNAV. Aircraft not certified for
RNAV may incur delays and/or extended routing during peak
periods.
2.22.3.3.9.3 Only a pilot-in-command of an aircraft not
certified for B-RNAV shall inform the ATC when establishing
the first radio contact.
2.22.3.3.9.4 For aircraft not approved for RNAV operations
vectoring will be provided.
2.22.3.3.10 Aircraft not equipped in accordance with
requirement 2.22.3.3.9 for RNAV departure routes will be
radar vectored to exit points of relevant departure routes.