[Elecraft] KX3 battery upgrade?

[Steve KC6ZKT]

The KX3 is my favorite of my HF radios right now. But one of my 
annoyances is the internal battery limitations.

I always wind up carrying an external 6_Ah or 10_Ah LiFePo4 battery into 
the field when I use this radio, an external charge controller, and 
solar panel. It's not a big problem, but it also should not be a big 
project to improve this situation. The KXBC3 has enough real estate to 
include a lithium battery charger, and even a solar charge controller in 
its space. The amount of battery energy that could fit in-place of the 
NiMH cells could approximately triple the capacity of the AA cells.

So I have these questions:

1) How many of you out there might buy an upgrade which replaces the 
KXBC3 board with a lithium battery manager, and a associated battery pack?

2) Are there any 3rd parties already making anything like this?

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SteveSgt, KC6ZKT, @CM97bj73