For exact dates at short notice (by which I mean <9 months), yes.

You may also find that if flying as two couples/pairs, one couple/pair could do a cheap ex-EU I-class booking to HKG and upgrade into revenue A via a GUF2/TA for only about £1k more each than the taxes, fees, and charges... so depending on what, exactly, you have, you might be better off using a 2-4-1 and a GUF2 on one booking, and just a GUF2 on the other, and all convene in F at LHR.

4x redemption bookings on a CX HKG-TPE service could also be tough.