There are only 6 places in the USA that do hemodialysis on cats.

However, there is another alternative - Peritoneal dialysis. Humans use this type, also.

Peritoneal dialysis uses the peritoneum (the thin lining of the abdominal cavity) as the filter for separating waste products from larger substances. The dialysis is performed with a special tube that a veterinarian uses to fill the cat's abdominal cavity with dialysis fluid. Waste products in the body suffuse into the fluid. The doctor then removes the fluid from the abdominal cavity and discards it, repeating the procedure until the level of waste products is adequately reduced.

Peritoneal dialysis is easy to perform in cats and is not painful for the patient. The need for constant monitoring and professional application usually limits the use of peritoneal dialysis to the treatment of reversible acute renal failures where the dialysis performs the waste removal function of the kidneys while the kidneys themselves are recovering.
An ARTICLE about deciding if dialysis is right for your particular pet.

I think it's important to determine the cause of the seizure in Braveheart, before running headlong into dialysis. Seizures can be caused by a multitude of conditions totally unrelated to his CRF.