Even more so for yourself, as I think I remember you referring to the FISA Lean as a "not-as-good" version of the Grammars.
Yes, the LEAN is basically an almost-but-not-quite-as-good near clone of the Grammer E3000 as used on most Desiros. Mostly not quite as good because the thick back means less legroom, but the shape is also to me slightly less comfortable, though that of course is subjective. Fine for a run to Shrewsbury, though, and thus probably fine for a run to Pompey - but not suitable for First Class on a train making a nearly-5-hour journey e.g. the Waterloo to Weymouth.
The idea of using slightly-nicer-looking versions of the Standard seats (or even just the same ones, yes, you, Southern!) is a well-known South East approach to 1st - but the thing is, 1st just being an expensive seat reservation for well-to-do commuters isn't so much a thing any more (hence why Southeastern are getting rid), and on LNR at least you don't even get a quieter environment because there's almost no enforcement, so anyone just sits there - often you're more likely to have issues with ASB in 1st than Standard!
So to me, it makes sense to do one of two things:
1. Make 1st really good, which means 2+1 *and* the niceties like leather, tons of legroom, curtains, lamps etc. (Plugs, much as I don't use them, are a standard expectation now), then you can make some money upselling.
2. Get rid.
I've come across only one 2+2 1st I thought worth the name, on the refurbished Domino units on SBB, because instead of doing 2+1 they did effectively infinite legroom - airline seats with about 1.2m pitch (about 80cm is more the norm) and fixed tables. But I'm pretty sure SWR aren't doing that!