Hi Dude - welcome to torquecars. The Esi into Vei is a fairly straightforward swap. The vei is built for economy 125hp the Esi is a higher power version 160hp. Both are VTEC. Check tht the mounts are the same. Get the wiring and ECU from the donor version as well this MAY also mean changing the locks & immobiliser. Gearbox etc should be ok - I'll do some more research on this for you.
Insurance - Always tell them. One day you slip on ice mow down a bus queue and the assessor comes round checks the engine - you find your cover withdrawn. You then get sued by the injured bus queue and prosecuted for driving without insurance. Typically under indemnity rules the insurers pay an injury claim on your behalf then recover this amount from you. :shock: