For a simple HO scale structure kit, a printed interior really won’t consume much ink. I’ve used several printers over the years, and all seem to do the job. I also use inkjet printers.
I use higher print quality settings for printing decals. Building interiors are just fine with normal quality printing.
Corel is good software but also not cheap. There are freeware options out there, most are available for Windows and Linux, some for Mac. Gnu Image is, basically, a free version of a mid-to-upper-mid level version of Photoshop and Inkscape rivals Corel and Adobe Illustrator. The drawback with freeware is that its documentation is not so straight forward, there’s fewer books to read on the programs and you have to be able to search to solve issues or learn tricks, or use an online bulletin board.
I have a Canon inkjet too and it works fine for what I’ve done. The interiors I’ve printed have all been ground floor on narrow structures so I’m not too concerned with ink consumption. I set mine back about a half inch from the front and that gives the interior scene a bit more depth than if I put it up right behind the front glass. I’m happy with the results.
All my printed interiors are in structures at a 90 degree angle to the layout edge so the viewer never looks directly into them. If I had a structure facing the viewer and up close, I would consider a 3D interior but so far that has not been necessary.
I’ve gravitated away from Corel and am now using Affinity Designer. Sometimes they offer it for $25 but even at their usual price ($55) it is worth every penny.
https://affinity.serif.com/en-us/
Regards, Ed