Block udp fragments to a single host while reassembling is on

Dear list,

i want to block udp fragments to a specific host while the reassembling is
turned on for all other traffic:

In pf I would write something like this:

<snip>
# reassemble fragmented packets (default yes)
set reassemble yes

# scrub all traffic
match all scrub (random-id no-df)

# block fragments to host 10.0.0.10
block log quick from any to 10.0.0.10 fragment
<snap>

For me, it sounds like this is not possible, because reassembling happens before
pf and it is only possible to turn it on or off as a whole, right? Is there an
other way to achieve this challenge.

Any advice ?

Thanks,

Joerg