Utf8 symbols in completing-read completion item

[Heime]

Am using "completing-read" to input greek letters. To introduce the 
corresponding utf8
symbol I just copy it in the completion item, then match with a pcase that 
includes the
utf8 symbol. Is this the correct way of doing so?

(defun nuket-greek (actm)
"TODO"

(interactive
(list
(let ( (cseq '("alpha α" "beta β" "gamma" "delta" "epsilon" "zeta" "eta")) )
(completing-read "Nuke: " cseq nil t "eta"))))

(pcase actm

("alpha α" (insert "\\alpha"))

("beta β" (insert "\\beta"))

("eta" (insert "\\eta"))) )