Well . . . on badly rusted stuck stuff always becomes a decision what is going to get sacrificed and what is gong to be saved to get it apart.
On this ChrisKy you want to save the axle, axle hub/bearings and the drum.
So I’d stop beating on that drum.
Sacrifice the adjuster, the shoes, holddowns, strut, and parking brake and brake cylinder.
Punch the adjuster through the adjustment hole unill it breaks out of place. Then see if the brake shoes will collapse in enough.
NO. With as much brake shoe now showing then punch hammer back through the upper show lining to drive back in and seat the hydraulic cylinder pistons for more clearance.
STILL NO. Then drill/grind/burn off the heads of the shoe hold down pins. Grind cut off the parking brake cables and housings and punch the stub trough released to the insides through the backing plate hole. Unbolt the hydraulic cylinders and then it should all come off.
Ha! I I’ve refuses to move to the salty ocean coast when my wife has hinted!! NO!!
90 miles has been plenty close enough to be an auto/truck mechanic, thank you.
From now on only tap, tap, tap on those drums going to be your cutter heads.
Ha! Easily replaceable drums then I’d be grind split the drums like a nut shell; sacrificed, to save all else. This is not your case.