indeed it looks more logic to raise the local preference for a certain vrf (rt) on PE1 (as an example) with an outbound route-map, and works fine with the RRSs too in the middle. PE3 receives a higher local preference and uses PE1 as next hop instead of PE2, that sends routing update with standard local preference.
The complete config on PE1 is then:
router bgp 65000
neighbor RRS1 route-map rise-preference out
neighbor RRS2 route-map rise-preference out
ip extcommunity-list standard TESTEXT permit rt xx:xx
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