Honestly, I have never tried to modify the glacia--it was not yet "invented" when I made pens for retail sale.
In looking at the pen top, it would appear to be two parts, but the insignia MAY be part of the inside cylinder,
so knocking it out will remove the whole inner piece, rendering everything unusable. I would expect this will
be unsuccessful. But, even if it is unsuccessful, it may lead to a solution--the inside piece with the decorative
design may be able to be reinserted with a different top--considerable effort for which you should be significantly
compensated in your end retail price.
It does have the "stem" referred to above, which is welded in, but I believe this holds the two assemblies together,
whereas in the jr. gent it is just the stem for the decorative piece.
When I did modifications, I would weigh the cost of replacement ($8 in this case) against the amount I could add
to the retail price for a totally unique pen (for me this started at about $50). So, if I anticipated success at the end of the
rainbow, I could waste 5 kits and still come out ahead. Food for thought??
Just my observations