Let's say West Francia and Middle Francia coalesce into a HRE analogue, while East Francia evolves into a sort of medieval Kingdom of Germany. Would this Kingdom of Germany be in a position to repel and christianize the slavic pagan tribes to the east (sorbs, pomeranians, poles, moravs, etc. like the HRE kinda did IOTL?
Alternatively, would a French-based HRE be more inclined to involve itself in Reconquista?