When the going gets tough - when the roads turn to muddy goattracks lightweight is right weight. But there are an awful lot of highway miles to get from Europe to the Stans where a T7/Transalp/Tuareg/CB500X/GS or similar would be much more conveniant than the Crf300.
My experience from the Stans is Kazakhstan and Kyrgisstan - and for the most part the roads were good. And that is 10 years ago - so I imagine roads would have improved a good bit in 10 years. Thats said - if you seach out for offroading and primitive gravel tracks - you will find them for sure.

Every bike choice is a compromise, you cant get it all in one bike. Can you do long highway miles on a smaller bike without feeling too bothered? I know I can but there are many who say they cannot. If you can you will be rewarded with a bike much better suited for the rough stuff (look up Itchy Boots in Africa on a Crf300 Rally and imagine yourself doing those tracks on a T7 or similar…?)

One of the more experienced overlander guy said that you should use a bikeand equipement suited for the worst part of the journey - because any bike can do the highway mile, but many bikes will not be suited for the worst part of the journey. This is of course depends on what roads you plan to ride and where you plan to travel.

There are a couple of alternatives «inbetween» a Crf300 and a T7 and that is the new CFMoto MT450 Ibex and the new Royal Enfield Himalayan 450. They are only approx 10 kilos lighter than the T7/Transalp/Tuareg etc but still worth considering.

Six months should be a relatively good amount of time from Europe to India and even Thailand/Malaysia. I rode from Norway to Thailand in less than 3 months. 30 days in China and approx 15 days in Kazakhstan and 12 days in Kyrgizstan, a week in Laos and the rest through eastern Europe - the latter transport stages I would call it. I rode a Tenere 660 btw.

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In the end everything will be fine. If its not fine its not the end....