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I reached out to FEIG Electronic since they make both passive UHF and HF (NFC) RFID readers. FEIG recommends you contact their partner GlueLogix, which offers an RFID solution for encoding both types of tags.
Founder and Editor
You should consider using tags having the em|echo-V dual frequency UHF and NFC chip. All the major inlay manufacturers sell them. The tag memory is shared by both the UHF and NFC air interfaces and it makes serialization and encoding much simpler and faster using only one type of printer/encoder, either UHF or NFC.