How hard (moreso costly) is it to put a modern drivetrain on a vintage mtb?

The stronglight kitted to my Spesh was 42/32/22. Plenty of those around for cheaps. Can always just replace the granny with a smaller.
What is the specific model please? Is that a new make of crankset, not vintage? Also will most newer cranksets be compatible with old frames? From what I see here: https://stronglight.com/en/categorie-produit/cranksets

Only see 24 smallest so far.

For example: https://www.sjscycles.co.uk/chainsets/sunrace-triple-chainset-with-detachable-rings-423222t-170mm/

That one is £54. Will that be compatible and is the stronglight you suggested cheaper/more easily compatible?
 
Well the thing with replacing, from what I read is compatibility issues as bcd mm are all different and for the tiny 22/20t ones they ask for 64bcd which seems like only few cranksets do.
Plenty of cranksets that offer 104/64 . Just make a wanted ad. I like M569 cranks.
 
The Sunrace will do the job, yes, but expensive for a tacky looking crankset. Just make a wanted ad on here and you can get something nicer for less or the equivalent.
 
The Sunrace will do the job, yes, but expensive for a tacky looking crankset. Just make a wanted ad on here and you can get something nicer for less or the equivalent.
I am fine with old but want to know what models I should look for which would be compatible for 64mm. Technical names and such.

I was not tied to the sunrace one, just the cheapest one I found that could take 64mm. So any other suggestions welcome the cheaper the better!
 
That is not the common knowledge on the subject of cassettes:

https://www.mtbr.com/threads/8-speed-cassette-on-a-7-speed-hub.738283/
So are 22t old school cranksets available? The lowest I have seen is 24 so far.

All old tech and 22t and max old freewheel/cassette would probably be the path of least resistance yes? Say 22 (inner chainring)/34 (max size freewheel) x26 to give 16.8 gear inch low gear would rival most modern 1x drivetrains.

If you use an MTB 5 arm 94/58mm crank set (Shimano M563, M737 for starters) then the 58mm inner will go as low as 20T. Fit a 28 or 30T on the back and you have around a 19" gear - which is all I need on a loaded tourer on Dartmoor.

If you have a 7s hub you can fit a 9 or 10 speed cassette, just leave off the smallest sprocket and run 8-from-9 or 9-from-10. Obviously you need a matching shifter and rear derailleur (7/8/9 speed derailleurs are interchangeable, despite what Shimano may tell you). 10 speed is totally different.
 
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