Electronics - 3 AY plus 1 beeper IN to stereo OUT

Can anyone with electronics knowledge verify that the following scheme
would work:

I would like to take this circuit:

http://www.tkk.fi/Misc/Electronics/circuits/linemixer.html

and modify it for four inputs, applying this circuit:

http://www.tkk.fi/Misc/Electronics/circuits/speaker_to_line.html

to the beeper input, to balance it with the AY input, in order to
provide an "ACB" stereo (with Beeper across both stereo channels)
output for connection to a television via SCART.

Seems a lot cheaper than buying a mixer for 40 quid, and would be
better than the current set up I have which is all four channels going
to the internal speaker.

Any comments gratefully accepted.

Cheers!

.

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