Hello mipe,
Beo4 and Beolink1000 are using the same IR-codes, so you can use a Beolink1000 with the BV3-32.... it will work (I am using Beolink1000 and Beo4 to control my BV 3-32).
For some of the commands you will need to use the "SHIFT" key of the BL1000, but this is no problem (for example "SHIFT"+"CD" for "DVD"). Here is a link: http://forum.beoworld.org/forums/t/38151.aspx
I've never seen/used the remonte in the link but it seems to be a rather cheap piece of plastic... so it is better to stick with your Beolink1000.
In case you realy want a Beo4 then I would suggest to try to find one via Beoworld (sales/wanted) section as you can get them for a fair price on the second hand market.
Cheers!
Foxtrott
"The first thing we do, let's kill all the lawyers."
Henry VI, Part 2 William Shakespeare