Never mind. I believe the (historical) advantages of the gismu creation algorithm, which is in principle a holdover from earliest Loglan, as I gather, lie more one the side of quelling (some of the) endless discussions about vocabulary than in anything else. Oh, it's probably a nice propaganda device, too.I think it is not of particular importance how the gismu look/sound. I can live with obvious oddities such as {ckafi} or {ketco}.
Also I didn't follow the discussion that resulted in the creation of these two new (unofficial that is, right?) gismu, so I still can't comment on their necessity.
I only cringed a bit when I saw my beloved German mistreated so recklessly. ;) By the way, the French is "vantr", not "vontr". :p
---iesk