You're right that those simulation would not include AWA and IR.
In terms of additional CAT's I would recommend you look at he specified GC thread, in which people share their experience with third party CAT's. (I could provide you with the link if you can't find it). As I have only practiced using GMATPrep and MGMAT I cannot provide you with any personal insight, but have heard good things about Grockit. You can have a look at their homepage and see if they provide AWA and IR.
Keep in mind that GMATClub tests
are very well accepted by the general publics and there may be a good reason for you for doing the following:
1. Take any newspaper article and try to write an AWA essay (find false arguments), based on chineseburned's AWA template
2. Buy any third party product for IR and do some preparation questions (MGMAT has an online question bank)
3. Do GMATClub tests
for Quant and Verbal in the end
Hope I was able to provide you with another approach:)
I would be happy to help, so let me now if there are any questions. Posted from GMAT ToolKit
Thank you very much for reading this post till the end! Kudos?