It's not a matter of money, but science. I believe that TAVR has not yet been approved by the FDA for low risk patients. Someone in another thread was offered the opportunity to participate in a clinical trial for TAVR in low risk patients. You don't always want to be in a clinical trial if you have a successful alternative. By nature the clinical trial's procedure has not been proven effective. The conservative approach is to go with standard treatment that is proven.I am 70, but in US Medicare will not pay for low risk patients to have TAVR. I am a candidate for a TAVR trial, as that seems to be the only way I can have it. Certainly don't have Mick Jagger type money to pay out-of-pocket.
The standard procedure with OHS is a "gold standard" with many successful operations. At 70, you can get a tissue valve and not worry about having a later replacement.
It'll go OK. I believe Medicare will pay for some in-house assistance post-surgery if it's needed. You should let your sister come to help, it'll be a good "catch-up" time for both of you.