"very cheap"?
and stealthy? LOL, no.
If you don't need a stealthy airframe, you use a LIFT like the FA50 et sim.
A Swedish KF21 block 3 (the version with the internal bay) is what I'm expecting Saab to make. Or I guess an "SF21" since it's a Swedish Fighter for the 21st century.
It's going to end up fairly close in terms of bay capacity to an F35. 2x AMRAAMs and 2x 2000lb bombs. Ideally something that would let you do some interesting mixes of loads, so more likely to be one larger bay than the two separate bays on the F35, or the 3 bays of the F22. Even the KF21 is a 56klb MTOW aircraft (25.6tonnes), so I'd be shocked if the SF21 was much-if-any lighter.
They might be able to make it STOL for a fighter like the Viggen was. Will very likely have 2 engines, not 1, because of how heavy the plane is. And I'm expecting EJs or M88s, not a US engine.