Have another B2B coming up LHR-BRU-LHR-PVG.

But will be travelling with my Mrs. who's non-EU passport sometimes means that OLCI is not possible, particularly for the LHR-PVG leg.

Am I correct to assume that we will be able to work it out at LHR check-in desks in the morning and get BP's for all 3 flights prior to our initial outbound?
Worst case, we can get the LHR-BRU-LHR legs covered and have time to go landside at LHR if necessary. Just want to avoid going landside at BRU and EU customs.