Changing inbound travel on Companion Ticket

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For a Chase 2-4-1 Companion Ticket, the T & C rules state that

"outbound travel must take place before the expiry date stated on the voucher, however inbound travel may take place after the expiry date."

If I have an expiry date of June 1, 2018 and an issued ticket booked for Feb 1, 2018 (outbound) and Apr 1, 2018 (inbound), can I, after flying the outbound, re-book the inbound for, say, Jan 1, 2019 (assuming availability) and pay the change fee?

The BA website appears to allow a re-booking of the inbound, but doesn't offer dates more than a month or so beyond the expiry date.

Does anyone have experience of the above, please?
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