Results for my research:

There are at least 2 different revisions of DS1000 datasheet. From years 1994, 1998 and 1999.
http://relay.pp.fi/Amiga/A4000/A4000U102/DALLAS%20DS1000%201993-03-01.pdf
http://relay.pp.fi/Amiga/A4000/A4000U102/DALLAS%20DS1000%201998-02-17.pdf
http://relay.pp.fi/Amiga/A4000/A4000U102/DALLAS%20DS1000%201999-11-17.pdf

Only the oldest datasheet presents 7 different packages for DS1000:

The first two are Dallas only:

Dallas DS1000-25 14-PIN DIP (300 MIL)
Dallas DS1000G-25 14-PIN GULLWING (300 MIL)

The last 5 have also been made by Maxim:

Dallas/Maxim DS1000K-25 14-PIN SHEARED NC
Dallas/Maxim DS1000M-25 8-PIN DIP (300 MIL)
Dallas Maxim DS1000H-25 8-PIN GULLWING (300 MIL)
Dallas/Maxim DS1000Z-25 8-PIN SOIC (150 MIL)
Dallas/Maxim DS1000S-25 16-PIN SOIC (300 MIL)

Mechanical drawings for all of these are available at some unknown name Dallas Datasheet book on pages 480, 483, 484 and 491

Dallas/Maxim DS1000K-25 is Amiga 4000T U102, Amiga 4000 U102 and Commodore A3640 U103 compatible. They can be used to replace original hard to find PCA EP8700.

Dallas DS1000-25 is Amiga 4000T and Commodore A3640 compatible and Amiga 4000 compatible if pins marked as NC are cut (NC = Not Connected pins are 2, 3, 5, 9, 11 and 13). They can be used to replace original hard to find PCA EP8700.

DS1000-25 is easiest to find and has been sold in Ebay by at least 3 different sellers. DS1000K-25 is easier to find than original PCA EP8700, but not common enough to usually be found in Ebay.

PCA EP8700 was offered to me with MOQ 100. Maybe they would do new production for that.
DS1000K-25 was offered to me with MOQ 6. With £18 each + shipping.
DS1000-25 I bought from Ebay (France) cost 9 euros + 2,50 euros shipping. That was not cheap but acceptable for something as valuable as Amiga 4000.

If you want to go very cheap then buy Dallas/Maxim DS1000Z-25 8-PIN SOIC (150 MIL) or Dallas/Maxim DS1000M-25 8-PIN DIP (300 MIL) from Ebay and put them in place with an SOICx to DIP14 adapter modify it, design your own adapter or solder wires between PCB/socket and pins. Use wires of equal lenght just in case it affects the delay.

Hope this helps those who repair A4000/A3640 or build A4000T from PCB like me.

Please note that all data here is only datasheet theory and not based on any tests yet.

Curry or garlic and cheese?

Deep fried fish and mayo, please!