Exactly. Having equipped both a javlock and an edun at the same time, you immediately feel all the inconveniences of use.
Regarding gunblades... I tried to use them simply by holding down a combo. Very uncomfortable. The melee hits alternate with shots and you cannot change anything. (I know that you can alternate 1 hit of a regular combo and 1 hit of a forward moving combo. That's another topic.) I settled on using only heavy attacks, as a slower but convenient option for 1:1 alternation.
Unfortunately, this is a different gameplay, since the projectile deals damage immediately and loses damage with distance. In my opinion, tennokai is more suitable for Corufell. It really complements and enlivens the fight. Edun, on the other hand, is more reminiscent of a melee javlock.