This is all going on memory from about two decades ago so that is why I say seek expert advice.
So in other words, you don't really have a clue what you're talking about?
There used to be a company set up in Dublin to promote starter businesses.
That is not the case here. The OP wants a
loan to set up a starter business.
The CEO wanted to be able to accept donations in a tax efficient way. He registered it as a research institute as opposed to a charity.
Again, not relevant here. No-one is donating anything.
There was a tax break at the time for people who covenanted.
Three years was the covenant term and 50% the tax break.
The company had to product a learned report to qualify.
There still is such a tax break ([broken link removed]). It is limited to 5% of total income of the individual. In this instance since the individual is "overseas" it is i) unlikely that they are within the charge to Irish tax, or ii) if they are taxable to some extent in Ireland, unlikely they have Irish taxable income of €1m which would be required to obtain full relief.
None of which is relevant however, as the situation you've outlined (people donating money to a research institute) bears no resemblance to the case at hand (a starter business looking for a working capital loan to commence trading). By definition people who donate money don't get anything in return and don't get anything back at all, in monetary terms. Was this not the case with the donors to the research institute you're talking about?
Any attempt to engineer a situation, where the form of the transactions would attempt to obscure the true nature would be a tax avoidance scheme, and liable to be viewed in a dim light by Revenue.
Similarly there may be still grants available for start ups.
Not my area of expertise, but depending on the type of business there may well be. OP should talk to his local Enterprise Board, Chamber of Commerce or Enterprise Ireland, where people with the expertise can point him in the right direction.
He asked himself the primary question - "who would know how to do this tax efficiently?"
After that he was guided to a knowledgeable person who advised him correctly.
Who was the knowledgeable person? (You surely aren't talking about yourself

)
This is the principle I am invoking - don't just assume one course of action.
Get advice on the best course of action.
You've managed to completely over-complicate this.
The guy wants a
loan Onq.
He's been to the bank and they won't give it to him.
He's found a counterparty who is willing to give him a
loan.
What you're "invoking" wouldn't work (tax avoidance - trying to obscure the true substance of the transaction), but even if it would, it would cost more than the benefit, on a loan of €50k. Setting up structures as you've described costs money (and requires the use of "experts" who will require to be handsomely remunerated!)
Say the interest on the loan is 12% p.a. and it is repaid over 7 years, that would be total interest of just under €23k, just over €3k p.a.
Assuming high rate Irish tax applies (which as I've already mentioned may not be the case), the potential tax saving is roughly €1,500 p.a.
How much would it cost to keep a "research institute" tax/CRO compliant for 7 years...
BTW, the CEO asked the Revenue.
It cost him nothing.
That's about the most sensible thing you have said, as they will not entertain what you have suggested, thereby saving him the need to pay to have an "expert" tell him the simple fact: The tax efficient way to get a loan, is to get a loan...