you can be fed up to build and/or modify your adv bike.. ( and i know this feeling myself) but if you intend to make all the things you plan riding, I guess you 're gonna be deep inside bike maintenance. and it's gonna be more time consuming than put some windscreen, usb plug , big tank and maybe sheep skin ;) . I did a lot of bashing about guys with big bikes... I stopped it when I realised : Would I really go, traveling, in a crazy single track, alone, far away from anything ? (me, ? yes of course ) When out of tarmac roads, 99% of people are riding on pretty fast gravel or light sand roads. Seems big bikes be ok for them...
It's always a balance in between fun and effiency ( the light more enduro oriented bikes) and sado-masochism which gives you satisfaction at the end. the "yes, i went through 10 km of muddy road on my big GS" .
Guess what ? I still wonder about the right bike.Preparing my next trip around Russia, Georgia, Turskish mountains, etc... , I plan to work roadbook navigation for future rally. Even if I'm still around the usual 10 kg of luggages for 2 months, I'm seriously considering going with....nothing except some tools and tires levers... Only a phone, a credit card , isreali army bandage and blood stop, a good rope, , as I won't be on Mars... If I need water and fuel for some kazak west desert , temporary cans will be enough.
It's not a digression, just to point that talking about fun, it's all about weight at the end... But there are different peaces of mind. Mine is to moan and whinge during trips about the hard saddle, the vibrations, the rain in face without screen, etc... But always comes a time where I have the perfect weapon to simply go back home when shit hits the fan .... Now my other bike with the magic starter button stays in the garage and i go riding the Big Red Pig with kickstarter : no battery, no electricity...peace of mind and lot of fun ;) .
Long aside, sorry, just to remind we ride motorbikes... Overloaded travelers and even too comfortable bikes can miss the point. You seem to be on the full fun side. So maybe you can take an exc KTM and go. some did it for 100 000 kms.. :)
not me on the photo. just love it :)