Would it also be possible to do this for Tempests as they are treated as Fighters though they carry 2 x 1000lb bombs and replace the excellent typhoon!
Not sure what you mean, but if you want the Tempest to be a fighter-bomber, just change its designation from fighter to fighter-bomber in the DB editor.
In the ETO these aircraft were not really used as strafers like in the PTO, they also had a slight reduction in forward armament.
Most of them were used as standard level bombers.
Does it really matter? This is the beauty of the game, you don't have to be locked in to historical concepts. The war was fought in a certain way, this is your chance to give it a go in a different direction. If it works great, if it doesn't, the only thing that gets hurt might be your ego. You haven't condemned thousands of aircrew to death because of your strategic/tactical blunders. Relax, enjoy and have fun!
Any ship can be a minesweeper, once.
ED/BTR Ressurection Project