I really can't see the big deal UK employers make about turbine time. If you a fly a heavy R22/R44 and know how to fly within limits, it's no big deal. A turbine start is 30 seconds out of your life, just follow the checklist. No drama.
As far as the ridiculous twin requirements employers are asking for, again, they are way too high. 50 hours is more than enough to get comfortable in a twin.
Being a good instructor is just as much hard work as being a police/EMS/Charter pilot, despite all the requirements employers ask for. Most 'high-time' instructors could easily do these type of jobs, given the chance.