加古「か」、衣笠「き」、球磨「く」、曙「け」、金剛「こ」。　指文字は片手で表現するものらしいので両手でする必要はないです。位置も胸元あたりでいいらしいです。

Kako's "Ka", Kinugasa's "Ki", Kuma's "Ku", Akebono's "Ke", Kongou's "Ko".
As it seems that fingerspelling can be performed single-handed, both hands are not needed. Doing it around the chest appears to be ideal.