Give the guys in Abbeyshrule a call,they do quite a bit of single and light twin maintenance,worth a try.
With guys like SR Technics and Shannon Aerospace, you're talking big stuff and they took on quite a few guys in the last quarter of last year so they may not be offering places for at least this September coming or perhaps longer.
Also try Air Atlanta in Shannon, but they're also heavy jet orientated.
Hope this helps,
Regards,
CP.