The first thing that I'd say is that, ultimately, the things you buy for the 'bike will have to conform to two basic tenets :- form and function. Beneath these, the subsequent considerations are cost and efficacy. But, overarching all of that is what YOU personally want, need and like. And can afford!
All that said I'd guess a few general observations might be worthwhile?
It is - or should be - possible to separate things that are more functional than fancy so I'd suggest that these should be your priority .... crash bungs, case protectors and the like. There's really no point having, say, a top notch, hand made, titanium and stainless steel tail tidy looking drop dead sexy on a bike that's sliding down the road or sitting on its side in a gravel car park - if you see what I mean? So, decide on the priorities - YOUR priorities - then look at the products available and determine the functionality over aesthetics first.
I personally think that Triumph's own engine case guards, sliders and fork protectors/bobbins always look so much more 'integrated' but I realise that Triumph branded products ARE invariably top drawer prices and don't necessarily add anything to the functionality of the product.
It seems to me that Evotech products are almost the exemplar standard for most 'aftermarket' stuff like crash bungs, rad. guards, tail tidies and the like, and they do always seem to get excellent first hand user reviews.
For tank grips, have you thought about using a peelable vinyl film? This type of stuff :-https://www.amazon.co.uk/3M-Paint-protection-mm-Clear-8591E/dp/B0017SBH10
Fairly inexpensive, easy to apply and remove, and a lot more discreet than some of the specific alternatives.
In terms of tank bag I'd guess that the Givi tank lock bag and fittings would give you the best choice of flexibility and practicality and their stuff is usually good quality.
Tail pack or seat fitted bags need to be really secure and well clear of any paintwork or panels and I'd suggest that, if one is available, the Triumph product is likely to be the better bet.
I can't (daren't!
) comment on your tyre choice other than to say it sounds eminently sensible. As does the idea of having the paint ceramic coated .... get the wheels done, too!
Any additional recommendations? If you haven't already, get a front fender extender and stop some of the crud being flung over the radiator and engine. Invest in a big bottle of ACF50 (other similar concoctions are available), some microfibre cloths and a spray/mist bottle - you, clearly, care for your bike so it's worth the seemingly inordinate cost and occasional aggravation of covering it in oil!
Best of luck with the buying spree - it'll all be worth it in the end!