Having sat in the CLio 3 Recaros for example, I´m not sure they will solve your seating position problem to be honest. I found them seating pretty high, almost as high as the 133 buckets, but their shape is better so they hold you better.
In my opinion, I would either keep the original seats or do the complete change and have proper bucket seats (Recaros, OMP, whatever brand you fancy actually) and install subframes.
Mine are really standard, and as I went for 4 point harness, I didn´t even bother keeping the original belts, but Al had a modification done apparently to still be able to use the original seatbelts. Maybe worth looking into it.
Also any bucket can be fitted with two rails to adjust the position forward/backward (i´ve got a set at home, never used it actually...) which basically means that apart from the seat folding on tiself to access the rear bench, you can have the same functions as a normal seat but with a proper bucket.
Last but not least, a lot of people don´t believe me when i say that bucket seats are quite comfy, until they actually seat in my Pole Positions