(Repeats Friday's story with no changes to text)
* Tit-for-tat measures will block access to Swiss shares
* Brokers complain of widespread confusion from sudden ban
* Higher cost, complexity to access Swiss market
* Market participants search for workarounds
By Josephine Mason, Helen Reid and Michael Shields
LONDON/ZURICH, June 28 (Reuters) - European stock investors and brokers are rushing to find workarounds before Swiss shares are blocked from trading on EU exchanges on Monday after a collapse in talks to resolve a dispute between Brussels and Switzerland.
In a heated row over a stalled partnership treaty, Switzerland said on Thursday that it would trigger retaliatory measures against the European Union for forbidding access to its stock markets.
That means as of Monday almost 300 shares in Swiss companies, including Nestle, Roche and Novartis, cannot be traded at EU stock exchanges which normally see around 30 percent of the volume in Zurich-listed shares.
The Swiss stock market has a market capitalisation of 1.1 trillion euros ($1.25 trillion), more than 10% of the pan European STOXX 600 index's total.
While few traders expect the ban to lead to a major market dislocation, some said it could deter them trading.
It could also get "trickier and more costly" for investors who do not have direct access to the Swiss exchange, Edward Park, deputy chief investment officer at Brooks Macdonald in London, said.
Many investors and brokers were caught by surprise by the ban, saying they were unsure how trading will work.
"The only consensus at the moment is confusion," the head of electronic trading at one global brokerage said.
"All brokers are coming up with different answers depending on where they're regulated, who your client is, it's a very confusing situation," he added.
How the aftershocks of the dispute play out will be closely watched by British officials, as they try to assess how EU shares can continue to be traded in London after Brexit.
"It will be interesting to see what happens and see if all the systematic fixes work and go smoothly because that will be the case for the UK going forward," one trader said.
Some EU regulators and politicians want to end Britain's dominance of European financial markets, raising speculation that they have opted for a tough line with Switzerland in order to set a precedent.
"This is a proxy of what Brussels could inflict on London," said Stephane Barbier de la Serre, a macro strategist at Makor Capital Markets in Geneva.