Lets work this out then.
With no spacers under the discs, and 6.5mm head height Ti bolts you've got 1mm clearance.
Adding the 4.5 spacers gives you 2mm to get a bolt head in there and maintain the 1mm gap.
I've had confirmation of the dimensions of 748 discs, but need to go and mock the gaps up on my M1000 before committing that they would definitely work.
The ones I know about are for sale, but I'd need to see them to access their condition.
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