Beginning to wonder if I should take something less precious and use it as a commuter and keep the Marin build true to form or if something like a riser bar/box stem would just totally ruin things.
Do what you like.....its yours.....if it means you can ride it....all good imho.
Provided you not sawing bits off the frame.....what harm you actually doing?!
If somebody don't like it, they can change it when its theirs!
Just enjoy your ride.