Thank you to everyone for replying and sharing your knowledge of the topic. A front luggage block on a Birdy bike, with the sports stem, would not work due to the geometry of the design; correct?

​​​​​​If it's true that a front luggage block on a sports stem Birdy has space Clearance Issues (i.e. it's a failure), then is there any point in discussing this at all? :-)
If a small luggage bag *can* fit on a front block, then I would imagine proper drilling or industrial adhesive may work to affix a block.

Please share if a block can accommodate a front bag, on a sports stem Birdy.