Has anyone come across hybridised kaffir lime.
I grow jeruk lime Citrus Amblycarpa and the smell of leafs and fruit is very similar to kaffir lime. Only that the fruit is much juicier and obviously far more usable in the kitchen. So I am interested to know if there is a larger fruit bearing variety that can be used as a substitute.

Merdeka lime maybe?

According to Alibaba.com web site they are selling the Merdeka lime for
FOB Price: US $5,000.00 per plant. The Merdeka lime is a cross between a Calamondin and a Kaffir lime. - Millet

Kaffir Lime is a Papeda Citrus type, so could start looking at other Papeda types or Papeda hybrids
http://users.kymp.net/citruspages/papedas.html

The K.L. is unique, a lot of these wont substitute directly at all.
Possibly C. macroptera, C.micrantha "Biasong" C. westeri "Sumayao",
may be closest ?

Also if you image search "makrut fruit" or "Kaffir Lime fruit" a range of types come up, including larger types it seems.

Is Citrus Amblycarpa related to kafir lime? It's more of a mandarin but smells exactly like it. I also once came across what looked like a grapefruit tree (there was no fruit on, so I can be wrong) with leafs smelling very similar.

Amblycarpa related to KL ? Doesn't seem to be in the Papeda group. I thought it was more mandarin related ?
A grapefruit like tree with KL similar scent, if so better go back and take another look !!
Sure it wasn't a Bergamot or Seville, which have strongly scented leaves, but more like Earl Grey tea than KL. Bergamot is very strongly scented.

I grow the bergamot and the Seville too and their leafs, although have very strong smell, are nothing like the Kaffir or the Indonesia lime. There is some sort of chemical in these two that make them unique.
The grapefruit (or what I think to be grapefruit) that I came across was grown for the kitchen use in a Portuguese restaurant which is no longer operating. Maybe that is the starting point of research. I will look at Portuguese fruit growing culture.

Portugese ? Any possibility restaurant also connected to the colonial past,
ie Timor, Indonesia, Sri Lanka etc ?
Might be some Kaffir Lime types there ?
There are local versions of the colonial European cusine in other places ?
Or it might explain how this plant got back to Portugal ?

Apparently merdeka limes can be bought per kilo for $30. And they contain seeds!

http://www.21food.com/showroom/140962/aboutus/levarson-biotech-sdn.bhd..html

Yes, but per one ton (2000 pound).

A search on Portuguese citrus is not getting me anywhere as many verities and their names have Spanish and Portuguese origins. And not much is coming up on kaffir lime hybrids. So my next step is to ask if any one attempted to cross Amblycarpa? And did the resulting plant poses that unique smell?