How can I get apps to work that require Google Play Store, without installing GAPPS?

Basically, I have a custom ROM installed (Ressurection Remix) without GAPPS (intentionally) on my Moto G5 Plus.

Almost every app works fine, but some don't. These are for the most part apps that I backed up and installed using Titanium Backup.
The specific app I want to try to get working is DB Navigator. It works almost completely fine, I can search for new routes and change settings etc. However, I can't see tickets that I have booked. I don't need to be able to book tickets through the app, but I would like to be able to see the tickets I have already bought.

My question is, is there any way to get this app to work without installing GAPPS?

(I apologize if this question has been answered already. I googled it, duckduckgo-ed it, looked through the forums and still found nothing :P )

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