You know what I meant Vickster, small 'tweaks' like changing a stem is one thing, but it it would be easy to go down the rabbit hole of adapting a bike so much that it should make you question if it was right in the first place?
I'm not talking about customising over time as you and your riding evolves, I'm talking about having to mess around with it and swap parts out right from new, to a large degree just to make it suitable in the first place.
Unless you are a completely odd shape (unlikely) then you are unlikely to hit that as an issue.
You've done your research - you've taken every step you possibly can - if it goes wrong - it wasn't through you being careless or rushing your selection process.
Sure £1000 - £1500 is a decent wedge of cash - but in the highly unlikely event of it all going wrong it's a not a life changing amount. Plus you can recoup slot from selling the bike on.
If it makes you feel any better - the one bike I brought I was sure would be right. (Knew the brand, knew the geometry, decent reviews) turned out to be a complete bag of nails - I ended up writting off the frame £1800 down the toilet - life goes on.