fietsbob

You should be able to stack mudguard mounts and the lower or bottom of the rack
at fork tip mount on the same bolt, add some spacers..

For higher stress use better steel bolts. 8.8 is marked on the hex head
of bolts that are using a higher strength steel for the bolt.

I got mine from an industrial fastener store.

Now for the top of the rack,
they are thinking of a thru the fork braze on,
Making a top mid fork fitting for a fork that has no thru the fork,
or ahead of the fork braze on presents different issues ..

Submit Photos of your test fitting .. no pix no clue..

Oh.. never mind the above stuff..

I would have a grand solution, ... send the rack you bought back.

Buy one of Bruce Gordon's lowrider racks instead.
as Bruce says 'Hoopless is Hopeless'

I have 25 year old BG touring racks that are still fine ..