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Given it would take both units out of service and it's known one unit was in use several months prior to the other its likely more hassle than it's worth.
Pembroke line west of Swansea has the below options to my knowledge.
Llanelli,
Pembrey and Burry Port (immediately off the west bound platform , council owned),
Carmarthen.
No stations west of Carmarthen with the exception of Haverfordwest have toilets on them or immediately in the vicinity.
You've got Pembrey and Burry Port in west wales where Pembrey is a 40 minute walk away.
You've also got Fishguard and Goodwick located in Goodwick and about half hour from Fishguard town centre, all up hill too.