Elkstone, the private equity firm with 50 start-ups to date, wants the terms of Enterprise and Investment Incentive (EII) legislation amended to encourage a culture of angel investing here similar to the United States.  The multifamily office, which was founded by chairman Alan Merriman, has said it believes it can unlock close to €50 million to invest in Irish start-ups if it can get this change made, which will bring the scheme closer to other jurisdictions.  Elkstone is an experienced investor in high-profile startups like Letgetschecked, Flipdish, Manna, Healthbeacon and Soapbox Labs. It predicts that Letgetschecked, Flipdish and Soapbox alone…