Very, very different volumes to SLS though (537000 US gallons for SLS, 5kg for a Mirai). So put a vacuum on the nozzle and vent it somewhere safe/controlled, and even 1% leakage is no problem.
Nuclear is always the answer, and I'm all for it, but good luck getting that built here, sadly. Yes, energy reliance isn't great, but resource reliance (lithium and such) isn't either. At least hydrogen you can produce anywhere, not so much with oil and natural gas.