Hi Ronan,
We grew on some pretty peaty mountain land near Sneem in Kerry and we made the most of what the locals called 'turtogs', the mounds of sod originally built up I believe by
ants to get themselves dry. We planted all our trees on them, especially important for apples.
The chinampa model would work well indeed for crops needing it a little less wet. We also took advantage of the climate though by growing a great crop of watercress in the stream (someone brought some to us from a
local shop & we just plonked it in the stream). We also juiced (with a hand powered device) a lot of the grass that grew lush with all the rainfall.
Peaty land will be pretty acidic though, so looking into plants like the Vacciniums (blueberries etc.) that like those conditions is a good strategy. Wet soils often leach nutrients quickly too, so you'd need to manage that. Scottish hill farmer Bruce Marshall doubled his yield from his upland boggy land by a simple strategy. He applied rock phosphate to address a mineral deficiency, then lime to increase the pH to a place where clover & earthworms could survive. He then sowed clover seed over the existing vegetation and brought in some worms from down in the valley. The clover then fixed atmospheric nitrogen in the system and the earthworms kept the soil from drifting back to a more acidic state. Clever chap!