Overecoming persist timer

Assume TCP session between Host A and Host B.

When Host-A advertises window of 0 to Host-B, Host-B uses persist timer
to send probe packet every so many sec (in 5 to 60 sec range). This is
fine but introduces atleast 5 sec delay in B resuming the
transmissions.

Is it possible for a Host-A to send a pure window update without Host-B
probing it (as soon as A detects that its recv_win has opened). Also
assume Host-A has no data to send..can it send a pure window update
pkt?

Basically, is there a provision to overcome recovery from win=0 state
without using persist timer.

Thanks,
Vishal.