@steubig Okay, first of all, I want to know everything about your baritone guitar journey, as I have sometimes thought about one.
Touch guitar basically has the same issue: it covers the bass and guitar range, and guitar gear isn't so great for that.
I am also a big fan of analog modelling pedals like Tech21. They just sound better to my ears.
You have a few other options. Given that you already have distortions you like on bass, you could easily just throw on a low pass filter at the end of chain to remove the high end sizzle. You could also do this in a pedal multi effect. I've done it a lot with my Line 6 pedals instead of using their amp models.
If you're using IRs, you may want something that will blend a couple of them in phase. This is because a single IR often introduces weird phasing or comb filtering (a real speaker moves and responds to impedance change, etc., an IR is a static snapshot--a sample really). I
think the latest Line 6 modellers offer that option, as do the Fractal Audio ones. Here's my explanation from the Fractal thread:
Fractal Audio Club
I don't really care about accuracy or trueness to life, I just don't want that hideous phasing sound I hear with unmodulated IRs.
<insert @ugly_bassplayer caveman joke here>
An exception to this is a free set of IRs that were my favourite for touch guitar when I was experimenting with this:
Shift Line Bass IR Pack The three "experimental" impulses are edited so that you get the top end of a guitar speaker but all the low end of a direct sound. Very cool.
You might also just like a guitar amp sound with the baritone. You'll have to experiment.
Now, tell me about the baritone guitar(s?) and what you plan to do with them + how you plan to tune them.