Hi guys, just looking to the wider FT community to see if anyone has any ideas for a little conundrum I'm facing.

I've booked a YYZ-FRA-PEK return, with a 23-hour layover in FRA on the way back. This is so I can sneak in a FRA-LCY-FRA journey (two one-way tickets) for a quick one-night getaway to London without upping the cost of the entire trip too much.

My FRA-LCY ticket is with LH intra-Europe, which doesn't grant any additional baggage allowance even for *G members. Therefore I'll be bringing only a carry-on from PEK to FRA to LCY. I intend to buy quite a lot of things in London for my return the next day; therefore I'll probably need to check a bag on the BA flight LCY-FRA. The problem is, I have very limited blank passport space and would hate to "waste" the space for two large Schengen stamps just to go through immigration at FRA, pick up my bag, recheck it, and go through immigration again. Does anyone see a solution here? Would BA through-check my bag onto an LH flight? Can I request to pick up the bag pre-immigration and therefore remain in the non-Schengen area?