Mate of mine is a P3C driver in the RAAF despite losing his spleen while he was at ADFA.
I suspect your kidney might be a deal breaker though
Edited to add:
Always happy to be wrong in these matters!
From the
CASA DAME Handbook
2.7.9 Single Kidney
If an applicant has a single kidney and this condition is developmental, renal function testing should be undertaken. If this is normal, aeromedical certification will be unaffected.
If an applicant has a single kidney due to nephrectomy, the cause of the
kidney’s removal must also be considered. If the underlying cause does not affect certification, then the same considerations of renal function testing and aeromedical disposition apply as for developmental variations.
ie: assuming the tumor is not now affecting your Class 1 medical, then you will be fine (once all the post-surgery etc is taken care of).
Good luck. Sounds like you have it licked