You can apply again without jumping through special hoops if you decline it AND don't have an ETP for something (age, TFCDS, etc.).
From the PSDM: "Those who decline are eligible to do so once and will be eligible for a future UFT board. Those members who had an approved ETP for age and/or TFCSD or had previously declined flying training are not eligible and should be counseled as such according to AFMAN 36-2100, Military Utilization and Classification, paragraph 3.3.2.12.1., UFT eligibility and ineligibility criteria."
That being said, this board was my second application AFTER I denied a selection to something other than UPT with an ETP as described above. Just talk to AFPC about your situation when they drop the next UFT Board PSDM (Mar/Apr probably) and ask how to proceed. I was essentially told I just needed to get an "Other" ETP to be eligible again.
Hope that helps!