That is exactly the route I took when looking at the EUNA. I have been using the Skeptical Buffer this year on my core board with an active bass so it shouldn't be needed strictly speaking, but it does still sparkly up the place.
Ryan at RCO pedals made a
Skeptical Buffer and I use it quite a bit and like it quite a lot as well. It is also an easy build but Ryan had one ready when I reached out.
The
Skeptical Buffer gains up the sound and has a baked in EQ in addition to the three EQ switches on top. It does not have a loop or tuner out. It also also does not have the fancy power section of the real EUNA and runs on 9V center neg only.
Sometimes I like using the Low switch on the bass guitar. I almost never have liked the Bright switch on bass but that's just my problem not yours. I also put it first on a dirt board once and I could hear that all of the distortions and fuzzes really appreciated the gain before I even played a note. They became more...distorted sounding and the XLF switch on my Hot Cake clone (Anomaly) suddenly became very bassy.
I only wish I could put it in a smaller enclosure. In that case I would get rid of the foot switch and leave it as always on under the board or out of the way instead of taking an entire pedal slot. It's a utility I like and appreciate.
Edit: Clarification on which device I'm using.