If the new tube can be fabricated I would still consider brazing.
To butt-join two tubes I'd find the next size of tubing and make a sleeve - similar concept to copper sweat-solder coupling, although I would use steel.
If you have to go back to the end block on the pump, I'd carefully bore or ream the block for a very close fit (tap fit, very slight press) and then braze. Tig welding is always a possibility (the demo pieces are out there of aluminum pop cans and gum wrappers tig welded together) but a greater skill level would be required...brazing is going to be a process that's much more forgiving with a thin section in my opinion.
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