Choice of bitrate when deinterlacing 1080i50 to 1080p25?

I (mainly) use a Canon Legria HF R16 for my footage, and my clips (original) have the following characteristics:
1 video stream: AVC
1 audio stream: AC-3
Maximum bitrate: 18Mbps
Video:
15Mbps
1920 * 1080 (16:9), 25fps (interlaced, 50fields/second)
AVC ([email protected])
CABAC / 2 ref. frames
Audio:
256Kbps
48KHz
16bits
2 channels
AC-3
I use Adobe Premiere Elements 9 with my Mac mini (OS X 10.10.2) for editing my movies. I currently use for export the "H.264 1920x1080i 25" preset with custom bitrate (the same with the original footage). After that, I use a seperate program to deinterlace from 1080i 50fields/second to 1080p 25frames/second. Should I use the same bitrate of that of 1080i50 to 1080p25? (Please note that the frame rate is the same!)

Stavros
Thanks for the reply.
I was not sure if you were asking about suggestions on 2*x for 1080p50 or other.
Because I mentioned
Bitrate setting is typically explore and experiment. You were going stay with variable bitrate?
I do not believe one size fits all for setting a variable bitrate. And, I was wondering if you were going to explore constant bitrate (I did not think you were but I just want to make sure.)
Have you done the mini test runs to validate any of the proposed bitrates?
ATR

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Choice of bitrate when deinterlacing 1080i50 to 1080p25?

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