I have also worked both outpatient (5 1/2 years) and now inpatient (7 months) dialysis.
It sounds like you would be well-suited for dialysis, your apheresis background is a definite plus - the hemodialysis (HD) machines - or peritoneal dialysis (PD) cycler machines aren't that different; a machine is basically a machine*. Also, your cannulation skills will help a lot - like apheresis, HD uses large bore needles.
Since you have recent acute care experience, I don't think you have to start in an outpatient clinic; if you can find a good hospital unit that will train you, you will be fine. I had a lot of problems with hospital policy and procedures after being away from acute care for several years (we didn't even have Pyxis then!); this will obviously not be a problem for you. One of the best nurses in my unit started there as a new grad! In inpatient/acute dialysis, you will deal with both routine HD and PD, and also with very sick pts in acute renal failure, hyperkalemia, or pulmonary edema; some are dialyzed in the ICU or ER, where you take the equipment. Codes aren't common, but they do occur (and IMO, it's much better to deal with a code situation in the hospital - in an outpatient unit,
you (and the other staffers) are the code team, and typically only with BLS and calling 911. Now that's scary!!
I admit I don't like codes 
) Keep in mind that in acute dialysis you will typically be expected to pull call shifts (nights and/or weekends).
In outpatient, on the other hand, you can be
very busy. Turnover - when the first shift of patients have to be taken off the machine and the second shift put on - is an extremely busy 2+ hours of your day. You will usually have your own assigned pts plus work with PCTs and/or LPNs. You will have other duties such as testing the water, calling the MD and writing orders, regular progress reports on certain patients, checking their meds, etc. A big drawback for me were the hours: I had to be there at 5:00 a.m. (which meant getting up at 4:00, and I'm most definitely not a morning person)! Some clinics do have more civilized hours, if this is a problem for you. A big plus in outpatient: you really get to know your patients, althought this is to some extent also true for our "frequent flyer" inpatients.
HTH. I encourage you to look into dialysis, it may just be the niche for you. And you will find out very quickly. Like pp said, you will either love or hate dialysis - I have never met someone who could take it or leave it
Best of luck to you,
DeLana
*
And I have no technical aptitude... don't ask my how I survived my training