* At first read carefully
Selex Galileo is not Swedish. You want to buy a Swedish plane using American engine, Italian/British radar, and Russian/Chinese missiles? Then, why buy this highly expensive but least useful plane at all.
Can Sweden supply dozens of aircraft at short notice in times of war? Does Sweden have this massive manufacturing capability? Which 'ally' of ours does have this massive manufacturing capability? The same one that is the largest manufacturing power in the world. So, is not it much better to purchase cheaper (at friendship prices, through diplomatic skills), complete aircrafts with all subsystems sourced from the same country without any restrictions, and the possibility of replenishment in times of crises?
None of our current missiles are ARH BVR capable, AFAIK. Why purchase expensive birds without powerful claws? Or, why buy expensive but blunt swords for fighting any enemy?
So, better go with tried and tested, reliable, and completely 'independent' countries like China, Russia and for subsystems/upgradation, Ukraine.
Bangladesh's airspace is not small. Who gave you that idea?
Size of airspace has nothing to do with procurement of aircraft. Ask the so called "Israelis" (just making a point; you do not need to ask them). Ask South Korea, North Korea, Singapore, and hoardes of other "small" countries.
Bangladesh has an air force, but no separate air defence command. We should beef up the air force now, and form the air defence command first, then strengthen it.