For the moment you can scan the 5x7 negative in two halves and then use Photoshop for automatic stitching to get a composed full image, it will work nice. This is the straight solution.
https://www.youtube.com/watch?v=imWsQqtcJPg Old versions of Photoshop also does it, at least CS4 I've been using.
https://helpx.adobe.com/photoshop/us...hotomerge.html
For the future IMHO you have 3 choices, I've been having a similar situation with 8x10:
1) Contact printing, this is ok, but you know, your prints will be 5x7
2) Invest in a new or used scanner, here my choice it would range from used Epson 4990 to new V850, all good enough for BW.
3) Use your 5x7 camera as an enlarger, like in the past times. Once upon a time there was a kit (for example) named Graflarger for Graflex cameras: https://www.graflex.org/speed-graphic/graflarger.html
This would be a DIY project that can be fun or nasty depending on your own resources to build a negative holder and a backlight to be attached to the rear of your 5x7 camera.
This is very far from a pro solution, really, but it can do the trick. If you use RGB led illumination for the backlight you can switch to red for red image while you frame the image in the paper, and then using different exposure times with green and blue (or yellow and magenta, as included red is safety light) to control contrast with VC papers. This is the solution I'm pefectioning as I guess I won't have a true 8x10 enlarger, but I also feel that the "graflarger" like solution is not to limit me at all, limitations are more inside us, IMHO.
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