I've thought about this on and off.
You can fit both a KL and an FE3/F2T into a BG chassis, using a mix of OEM mounts.
Therefor, you SHOULD be able to fit a KL into this chassis as well. As well as a BPT. (But why?)
“One thing I’ve noticed over the years is that if you drive into London at 6am, half of the cars on the roads are Porsches and Astons. Whereas if you go in at ten to nine, they’re all Renaults. Simple solution, then. You want a nice car? Get up earlier and do more work.”
— Jeremy Clarkson