Have you tried recording your drums as a Multi Pad?
It is very easy to do and can be made to loop endlessly and seamlessly if you get the timing correct.
If both (or all) drum sounds that you want to use are from the same drum kit voice, then you can record them all on the same pad.
If they are from different kits, then it is easiest to record each on a separate pad and then play back both together.
When you play an MP, you can alter its tempo, or if a style is playing, it will sync to the style tempo.
Why not try it and see if it offers what you are trying to achieve.
Regards
Ian