Imported plants may be out of order because of biosafety and liability laws, but is there a ban anywhere on genetic manipulation of house plants, if done by an EU company?
In principle there isn't. But there are laws about introduction of such organisms. So it's fine to do that in a lab. But the moment you put the plant in a pot on your balcony you are in trouble.
You need official approval for that. But obtaining it is borderline impossible. Not even the biggest agrotech corporations are trying anymore. There are only a handful of approved organisms, and some countries in EU go even further and ban them as well.
So nobody can use them, so nobody will sell them, so nobody will develop them.
There is an ongoing effort to bypass these restrictions for CRISPR based technologies. But who knows how effective will that be.