Anything's possible. You might go ahead and spend a few dollars on cables to hook this EQ up to your rig.
I don't remember how I acquired it, but I have an old 70's era MXR stereo mixer (complete with woodgrain panel siding!). It's 10+10 bands, plenty of sliders, about the size of a DVD boxset or a large-print bible.
I happen to LOVE EQs. People lump them in the "effects" category but in my mind, they're not meant to be supplemental, they're required. If they were "effects" and I was only allowed to have one effects unit, it'd be an equalizer. They can clean up sound, and with my main amp (a Fender Bassman silverface), I don't have any fancy Trem or Reverb units, and the 2-channel EQs are very limited. So an EQ pedal makes it.
I've already got some EQ pedals. I've reluctant to pass a new one up (I don't have the MXR you're talking about), and effects with built in EQs (ala EH's Graphic Fuzz module, which I want but am not fond of pedals that require power adapters to run).
I don't recall why I don't have the MXR EQ near my rig anymore, but a few months ago my friend and I were going through the junk in my basement, he saw the MXR unit, and now it's on his computer desk. I'm not positive, but I think he's set it up it to mix down clips with his Marantz 8-track.
My point is, try your EQ out before you lay out cash for a new EQ. granted, these things were not made for guitar effects loops, but it IS an Equalizer, and does just that. You might check the frequency regions on your Realistic unit compared to the modern MXR, but chances are it will suffice if you're on a budget.