Best Mouse & App for Remote Desktop on iPad Pro

Situation:

The interface for iOS (touch and keyboard) is limited, but absolutely fine for apps designed to run on the iPad.

With the portability and sceen quality of the latest iPad Pros, the iPad is becoming a great way to remotely connect to PCs. One massive floor with this is that the software on your remote PC is likely to work best with a mouse and this is where the iPad interface begins to become a problem.

I have seen many posts on this over the years and there are mentions of the Citrix X1 (which is quite hard to affordbly get hold of in the UK) and alike, but the answers are scattered and often related to older versions of iOS. Another problem is that bluetooth keyboards seem to get little support when remoting too (cmd,ctrl,alt keys etc often do not work).

Question:

At this point in time, with iOS 11 and an iPad Pro, what is the best software and mouse to use when remoting to a PC for actual work-related tasks?

(With the purpose being to use PC programs that need mouse and keyboard shortcuts, such as CAD or photo/video editing software)