At the time of this question is written:
a search about "g-wan" returns 113 entries (the existing tag)
a search about "gwan" returns 38 entries
Since there is no possible confusion with other tags, creating the synomym would help readers to find the relevant contents and to avoid duplicates.
I am requesting opinions to vote this suggestion up because I have a reputation of 1,196 points on Stackoverflow (not enough to create this synonym).
UPDATE (following a reply that does not answer the question):
[g-wan] and [gwan] DO NOT give the "same results" at all (different questions are returned), not to mention the order (either "Newest" or "Relevance") which is ALSO different