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Goldtec keeping things TIGHT I see still, those guys know their way around a tolerance sheet!
Before you struggle any further, push axle back out and proper examine the inside cut face of the hub for damage. Any misaligned bearing smacked into their in the past will leave a scar and this scar will prevent the bearing going in correctly full stop, or if you do get it in, will put a stress point on the cartridge causing it to grind/fail super quick.
As MV if all is well, make yourself a stack and tappy tap it home, or find a mate with a proper bearing press (hydraulic car sized or fly press style) and wind it in. Even a jumbo vice can be used.
Have even had success with Irwin vice grips large/heavy duty, it generates a good 150-200 kg of compressive force, half made of plastic too so allows some flex/out of line goodness where it won't destroy your hub if you get things slightly wrong.
You can use a hammer and punch, but just be sure to only hit the outer race of the bearing, if you have a washer that goes over the axle and covers the seal area that helps.
Bee sure to keep it "square" by tapping all sides evenly.