change derailleur and shifter in an old road bike reconverted to hybrid I have an old road bike, that I converted to a hybrid bike, I just use it for small tourings. Some time ago I changed the handlebar, the brake levers and the tires.

Recently the derailleur broke up, it was in bad shape and there's no way to repair it, so I just want to get a new one, also I would like to replace the shifters, as they are the old ones that are on the frame, and put triggers like an MTB.

The bike has a 6 speed cassette, I was thinking in a cheap Shimano Tourney derailleur but I can't happen to find trigger shifters of 6 speed on online stores. My idea would be to put a 7 speed shifter with just 6 speeds and someday change the cassette.

What you think? Would be possible to put a 7 speed cassette? Any other suggestions?
It's best to have chain, shifters that match your cassette, both in terms of number of speeds and make (and to a lesser extent model).

In a non-matching configuration, your chain will try to sit slightly between gears in certain settings, which is actually rather annoying.

Having said that, what you propose will work for locomotion, and depending on how much annoyance you're cool with bearing in a given day it may work well enough for your desires.

I tell you these things as someone who has piecemeal upgraged from 7 to 9 speeds; it isn't an ideal solution.