Can I have dimmable LEDs in a corded lamp?
I don't think you need to consider leading or trailing edge at all. Incandescent dimmers are leading edge and government energy regulations (e.g. Energy Star) lead to broad compatibility with them.

Speaking for US products, personally, I have a Cree bulb running on a Lutron C*L (designed for CFL/LED compatibility) plug-in dimmer just fine. You can see from this list that even CFL/LED dimmers are leading edge, yet they are compatible.

I suggest checking the compatibility lists, looking for a LED marketed plug-in dimmer, and trying it out.