Hi - I need some advice! I was due to fly to Mauritius with my wife next week, having booked reward flight Club World seats using Avios and an Amex Companion Voucher. Unfortunately we need to cancel!

I understand i'll likely end up with a Future Travel Voucher for the full value of the booking (ie including the cash, Avios, Companion element). Question is how i then use this?

1) Presumably i can only use this vs a new reward flight? (ie i can't just select a non-reward seat and use the FTV against it?)

2) Given you can only use the FTV by calling the call centre, it seems like it'll be pretty hard to get in-demand seats like Mauritius for which i think the reward seats tend to go very very quickly after release online. (and the call centre isn't open when the seats are released around midnight) Is this right? Any tips to ways around this? Might I be able to book the reward flight online using more Avios and another Companion Voucher, and then call the call centre to then swap it over to use the FTV instead?

Any advice appreciated! TIA