Honestly - I don't particularly care about illegal immigration, so I'd happily carry on broadly as we are (while trying to broker more return agreements with countries of origin). As you likely know, its a very small part of overall immigration (so it's likely more "symbolic" of public grievances than an actual big part of the problem).
But, obviously, it is a central electoral issue at the moment - and its certainly not unreasonable to want to deter illegal immigration.
Short of mobilizing the military against small boats (which we can only realistically do if we first wave goodbye to the European Court of Human Rights and the domestic Human Rights Act) there isnt much we can realistically do to prevent channel crossings.
Farage's plan (beyond scrapping the HRA) is to enter into agreements with foreign countries and pay them to take illegal immigrants back - which is pretty similar to what we do already so I'm not sure why he thinks it'll work for him.
Otherwise, if the UK wants to operate within existing human rights frameworks, then deferring immigration by making it extremely challenging to live in the country as a non-citizen is the best option, and thats what mandatory, digital ID would do.
Is it true that a government, that wants to suppress its citizens, would likely find it easier with centralized ID? Yes, if it was also minded to run roughshod over human rights. I wouldn't want (for example) to have to have digital ID in a country government by Trump. I'm happy enough to have in Canada, though.
What I cannot understand anyone wanting is a Reform government who would immediately remove or undermine all citizens' human rights. Its odd to me how many on the right seem completely unphased by the thought of human rights laws being repealed, but have a huge objection to ID cards based on human rights concerns. Its nonsensical.
(Not saying that last para applies to you btw, I dont know where exactly you stand).