"Destron" would be trademarked, but regular words from the Japanese language aren't.

Here's a suggestion: 電子戦士 (denshi senshi) - it means "electric warrior" which is G1 Bludgeon's function. You could also have 電磁戦士 (denji senshi) which means "electro warrior" and has a cooler (more complex) looking second Kanji.