Not sure how putting the bearing in a freezer back will help pack it apart from keeping the mess localized. I had the bearing also laying on a piece of plastic bag and used hands and a thin screwdriver to push the grease in between the rollers. than, when everything looked full, I used the air blower (5 bar, narrow snout), to softly blow the grease in and through. If it comes out on the other site, its ok and you are sure that a lot stayed on the bearing walls. Off course, after doing that you should try push in some more with your hands to replace the blown-out grease. I like to make things complicated when easy is possible also.
Anyway, the freezing trick worked a treat. One of the special stamp forging hammers fits perfect on the drive flange, two blows with the second hammer and in it was. I later used a rectangle piece of metal and a lighter hammer to get the seal in evenly, it now sits about 1 or 2 mm (thickness of a match) above the axle tube
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Ready for install tomorrow
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It's always nice when things can go in easy with one or two taps. I'm glad the advice made the task easier.