I did a "d
oublized triple" the other day
bought this frame:
Nice 22/32/44 Sugino triple
Messed up middle ring.
I couldn't find a good middle replacement so I just put the big ring in the middle position, with some short aliexpress bolts.
Now it's 44/22
Shifting with a tricolour 600 road mech and a deore friction thumbie.
The shifting is surprisingly excellent. It's good for trail riding even.
The 22t gap? No problem at all. Could be bigger.
The only annoying part is it requires quite a lot of trimming, but that is only because the cage curvature of the road mech is not ideal for a 44t cog.
Maybe this is helpful. You can definately do what you want with a triple. I just advise a friction shifter.
48, 44, or 42 are much more common than 46 though. Maybe pick one of those