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I have found 6500k 2pin in that form. CRI is OK, 80-82 is the highest I've seen. So I'll never get the 'true' natural light I'm after.
I've even gone down the rabbit hole of SAD lighting.There are lots of options with traditional screw in or bayonet fittings and I'll need a mixture of both so should be able to avoid renovating the fittings.
Just getting up there to change them, renting a ladder, writing a will etc
I doubt it. I was as fan of Thorn 2D when they launched as the form factor allowed for nice luminaire designs, but they're a liability now. There are LED conversions available, but you're not going to find anything with a high CRI and they have a lower lumen output than the original fluorescent.
I'd be trying to change the fittings, if you're sure your rent contract prohibits that then get your landlord to sign off on it.