Jumper the board as you would for 2732s at both U2 and U6. Install your 2732 at U2. I’m fairly sure that will work. And, the board will be “universal” in that any ROMs can be made to work in it.
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Chris Hibler - CARGPB #31
Http://chrishiblerpinball.com/contact
Thank you for checking out the PinWiki - http://www.PinWiki.com/

So double the ROM image and install at U2?
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
https://www.youtube.com/c/ChrisHiblerPinball
http://www.PinWiki.com - The Place to go for Pinball Repair Info

I'd like to add this info to the PinWiki.
To summarize, Bally games released with a -17 MPU can use a single 2732 at position U2 of a -35 MPU, by implementing the following jumpers (copied from @quench's post above.

E12-Gnd _____________ U2 /CE ~ Pin 18 to Gnd
E11-E15 and E35-E16A _ U2 /OE ~ Pin 20 to /VUA-O2-A12
E13-E9 ______________ U2 A11 ~ Pin 21 to A11
E7-E8 _______________ U2 A9 ~ Pin 22 to A9

Remove any jumper at E13A above U1 - any other jumpers should be irrelevant.

Does this require a special ROM load, or can the original 2716 ROM images simply be combined with:
copy /b U2.716+U6.716 CombinedU2.732

Thanks for documenting this method everyone here.
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
https://www.youtube.com/c/ChrisHiblerPinball
http://www.PinWiki.com - The Place to go for Pinball Repair Info