That’s my kind of solution Djozz……KISS
Way to think outside the box. 
Wondering how you like the 3500k LH351D? Is it a SPHWHTL3DA0GF4UPP6?
I would have to look the code up, I bought a whole bunch of these from contactcr a few months ago. I like them a lot although they are not holy grail leds: the hotspot is still slightly above the BBL when used in a reflector light. On a white wall they do not look rosy but in actual use both indoors and outdoors the tint is very attractive and the colours it brings up look great.
I purchased this cheap zoomie to leave in my work car for emergency use. And after removing a real XHP70 from my Buffalo mod, it was time to put it to some good use. I had practiced my first dedome on it. The tint was a big improvement and the light performed much better. If anyone has a suggestion how to mod the driver for a little more amp, but not too much, I’m all ears. 
XANES® 1282 XHP70 LED 3 Modes USB Rechargeable Telescopic Zoom LED Flashlight 18650/26650
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The led was loose, so the thermal compound did not spread across the board, it was a copper mcpcb.
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The fake XHP70
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Got a picture of the driver? May be pretty easy to bump power, may need a driver swap…
Usually there will be a sense resistor, labeled R080 or R056 or something like that… reducing that will give you more output but reducing it too much can fry some divers… totally depends on what the driver is. There is a good online resistance calculator I like to use from SengpielAudio, a lot of times it’s easiest to stack a resistor to get the desired result. I’ve used salvaged R140’s for this for years, removed from drivers I replaced. (The D80 had two of these, I had a LOT of D80 drivers I’d swapped out!)
( in that link, scroll past the first box down to the larger calculator, )
I wanted a BLF LT1 but already blew my budget on flashlights. So I give to you the milk LT1054AA Nichia:
Nicely hacked together 
. I love the complete absence of a thermal pad connection. 
Lol yeah…thought about trying to hack in a heat sink but whatever. Had a 219C that I don’t really like so figured I’d just throw it in for fun. It runs pretty low, to be determined whether or not it blows up!
forsh, since they have all the sense resistor pads bridged with zero level resistors the only way I can see to improve output is through a better MOSFET. That may be difficult to find in the package they used, but there are some or have been.
We used to use one that I still have a few of, back when Comfychair started hacking 105C drivers into FET controlled direct drive. The numbers are in my mind but jumbled, something about N and 0 and 7… lol (memory, totally sucks) I’ll see if I can find em and let you know what to look for.
Ah yes! I have a few of these laying around as well! Are these still relevant?
Bingo! Thanks Jos! 
The ones we used back then were Vishay branded, hard to find even then.
Relevant for a driver that uses this package size and needs a better MOSFET… like the one forsh is working on.
I remember they were getting scarce at one point, and MTN only had a few left in stock so I ordered a couple. Never used them because right at the same time I kind of got out of modding for a good while. Bought a ZL SC63w at the time and that kept me satisfied for quite a while…
I modified a D25LC2 Mini clip for use on my S21A and C8+:
The D25 was my EDC for a long time but the screw holes failed. An M2 x 6mm screw and nut fits perfectly for these clips and lights. I think the clip just made the S21A my new EDC!
In fact, I would like to know where I can buy more of this or similar clip model (?). Only if the Convoy clip was as good as this one.
I guess that the AliExpress store of EAGTAC has them, but you need to confirm!
Wow, I never knew they had an AE store!
I guess it is relatively recent there, maybe from last year, but it has lights, clips, batteries and accessories ! And your search gave me some ideas as well concerning the clips
BTW, some time ago I did something alike to get a less pretty result, compared to yours