There’s a thread that goes into greater detail about the potential (very rare) side-effects of long term antiviral therapy here: Possible side-effects from long-term antiviral therapy. Basically, renal impairment is very rare with TDF and pretty much not reported at all with TAF. People can be switched over to ETV if they do have some existing renal issues and they want to be on the safe side.
I don’t think you necessarily need a hepatologist that specialises in viral hepatitis (as much of the monitoring can be done by GPs as well), but I think you need to feel like you’re being listened to and your concerns addressed. It doesn’t sound like this is the case at the moment. I suppose if you can seek a second opinion that might be a good option. I don’t know the system where you are, but I would have thought you can be referred to another centre that does fibroscans; the hepatologist themselves don’t necessarily have to do it. Usually, a sonographer would do both my ultrasounds and fibroscan.
Re: statins, I wouldn’t have thought that there was anything wrong with having hep B and being on statins. I think there have been some large trials that show statins even having a slightly positive effect in preventing liver disease progression.