One solution is to keep your present brifters and find an old pair of downtube friction shifters (and a clamp with bosses) so you can shift the triple.
Added advantage is if your rear brifter fails you have a back up.
A single front bar-end shifter would work too if you can find a second hand one
Micro shift has bar end shifters on Amazon for a reasonable price and that's probably the route I would go