Austria seemed to act at around the same time with the same measures as Ireland. So I don't know if was quicker or harsher. They have been quicker to ease restrictions.
The border wasn't locked down in Austria really, border checkpoints were temporarily reintroduced but they couldn't have refused entry to an EU citizen or their family. I think most were clever enough not to travel.
The Czech's seem to have ignored the EU on border control , they could be the subject of infringement proceedings but I think the Commission might be clever enough to let that slide. They won't allow a complete ban for a year on anybody entering the country like their PM wants. Their lockdown began four days earlier than Ireland's.
India too has fundamental rights which seems similar to the ones you listed. Whatever you think of the rest of India and its democracy, Kerala is an anomaly. A highly educated society that takes government and rights seriously. So it is not easy for the government to take action which disrupts people's rights, freedoms, etc. But given the context they executed it. Maybe I am biased because I was born there and someone like @dmishra maybe able to provide a more neutral perspective.
I do think Austria, even if they did not completely lockdown borders, did reduce the number of checkpoints and introduce stricter controls and checks. Given Covid-19's symptoms, they may not be effective in identifying all cases into the country but I think that additional checks will discourage a lot of folks from crossing the border.
Most of my family live in Kerala but I have family in the neighboring states of Tamil Nadu and Karnataka. They all want to get back to Kerala as Kerala has been so much more effective in dealing with this disease. The only thing which is discouraging them from travel is the checks and conditions imposed at the state border followed by quarantine requirements.
I don't know if the UK introduced any checks at airports now but my understanding was that there was no checking or quarantining at the airports as recent as March or April? Something to at least psychologically deter people from coming in. Having said that what worked in Kerala, Austria, Czech might not have worked in London just because of the scale. London is multicultural attracting travelers from all over the world in a way very few places are. It is too connected. Maybe the strategy would not have worked there. But I am not sure if the government did even think through some of these issues.