A lot of people do this.... It's common.@tibby and @roadsterdoc .
Thank you guys for your help.
I think l am going to order additional ECU which comes preprogrammed with a tune.
I simply don't feel comfortable talking the original ECU out and sending it to Europe.
Plus, who knows what the turnaround time is.
Ordering another ECU sounds like better idea for multiple reasons.
Plus it's an easy installation.
It is a pity there are no plug and play solutions for this like there are for other cars.
I think it all boils down to rarity of these cars and size of the market for tuners.