This is better way to go because of diameter increase of 18mm but also because clio disc is actually too big for that conversion as the standard caliper brackets position for 276 so you get 2mm high lip on your discs outer edge.
Outlander caliper brackets can be found online & sometimes very cheap on eBay, Febest do them
Description: SUPPORT FRONT BRAKE CALIPER
MITSUBISHI OUTLANDER CU# 2002-2006. MITSUBISHI OUTLANDER CW# 2006-2012. MITSUBISHI LEGNUM EA/EC 1996-2002. MITSUBISHI AIRTREK CU# 2001-2005
Mitsubishi Number: MR307282
Febest Number: 0477C-CWF
Discs are 294mm from Legnum, Galant etc
Discs can be had for less than £50 a pair which probably good choice for first development effort, discs will need drilling to 4x100 & while in machine shop make centering ring adaptor (69 to 61mm) & spacers as required.
Caliper itself can be any Akebono 2pot from evo1/2/3/4rs, Galant, Outlander etc & cheap if hunt around ... Caliper rebuild seal kits are cheap on ebay (pair £25)
very cheap fast road & light track upgrade & low cost if you hands on & build up parts when come up at bargain prices..