P.108 was almost a non-entity in the war. Shouldn't be anywhere on the list of new things to add to AH anytime soon.
Emily is also extremely limited as far as its application to AH.
Right now the axis don't need a heavy bomber. Why? In the MA the allied bombers are available. Use them for heavy drops. In the SEA/scenarios/etc the axis won't have had a heavy bomber anyways, so they don't need it.
What is the point in pushing/forcing a heavy axis bomber, especially when your only choices are rare bombers that had little to no service life?
Far more important to fill out the axis bomber set with the bombers that actually represent the historical forces. The MAs will see to themselves. The SEA/scenarios are what need help, and they need lighter, earlier, bombers.