Brexit and that darn border issue that won't go away

No, I'm not about to do a "Blue Peter Reports" from bit as apart from anything else they'd never have have anything political on the show which given it's for children is quite right although sometimes I'd watch some of the current affairs shows in my mid teens just cos I was curious to what the grown ups were talking about.

 The last time I said anything about the long discourse that is Brexit I made reference to what this map shows, the Island of Ireland which really is the biggest sticking point in this process.
The problem starts when you look at this map.
The Green portion is what is now called Northern Ireland but what was when I was younger referred to as Ulster which is a part of the United Kingdom of Great Britain and Northern Ireland and the Orange portion,The Republic of Ireland aka "Southern Ireland" that since 1922 has been a self governing country in its own right.
For all our bloody history there has been good arrangements made between both halves and between the U.K. and the Republic when it comes to being able to trade and for citizens of each to have good common political, economic and social rights from day one of the partition of the Island of Ireland.
Even during the so-called Troubles mature heads on both sides went to great pains to co-operate.
One we appear to have forgotten and is directly relevant is the UK and Ireland collectively joined the Common Market in 1973 which was formally taught to me as junior child at the time in school and the whole joining marked although it's fair to say I'm not a fan of what is now the European Union.
Part of that was about co-operation about the exchange of goods and services across that border transformed to what was the Common Market and it played a part in the "Good Friday" Peace accords that delivered relative political calm and saw Sinn Fein the Pan-Irish Republican party give up support of terrorism on the streets of Northern Ireland.
Thus this stumbling block around the common Republic/EU border and that of Northern Ireland and UK is a major problem.
There is movement  of good and services between both parts of the island which pre 1973 had been agreed although there was a need for checking of paperwork and border posts moreover in this talks it appears to had been agreed such a system  - a "hard border" - has been explicitly rejected from being a part of it.
The Irish Republic is strongly opposed it.
This would be fine other than the rejection of any long term staying within the EU Customs Union on the part of the UK Government that makes such activity practically seamless coupled with the opposition of the Northern Irish DUP party and many others to any "except for Northern Ireland" deal that would also put a customs barrier between one part of the UK and the mainland.
I have to repeat my caution I cannot see any way of squaring this without actually having a Hard  Border admittedly one where every effort was made to make it as simple as possible with standardized forms and with  arrangements such as shared passport/visa checking on trains.
It isn't that one wants it but it seems to be the most honest thing to just accept it, making it the best we can out of realism as only that seems to meet the needs to ensure customs are  handled correctly for  each party and to provide a realistic trading situation.
It is what it is given we decided to leave and have started that process.
Offering any kind of an extra year of staying in with extra payments to the EU doesn't really solve this enigma apart from uniting the governing party against the Prime Minister which makes the political situation much worse providing less of the stability not just the process needs but business too.