You can mix and match but the issues are different. Trickling works best when broodless. It kills open brood and can damage the queens if used too frequently as they ingest the acidic syrup. OA trickling only works with syrup....no-one is sure why and the OA crystals that form are large and small.
OA vaping can be done any time. A dose now is good..And the crystals are minute and sharp edged.
The bit to watch with vaping is it only hits phoretic mites not those inside brood cells. So normal routine for autumnal vaping is 3 to 4 vapes spaced at 5 day intervals to get the merging varroa as they leave the cells. You get an occasional rogue hive that continues to drop 100's of varroa. Various theories abound as to where they are coming from, but no-one knows for sure. My record was 10 autumn vapes on one hive to get drop numbers down to single figures. It survived and overwintered...
The mode of action of Oxalic acid on killing the varroa is unclear. Some think the vaping crystals dissolve their feet or that ingestion or contact with OA makes their blood stream and internal chemistry acidic and hence prevents many essential enzymes from working. Whatever it does it kills them effectively as long as the application is correct. i.e the dribbling is actually onto the seams of bees or when vaping from beneath an open mesh floor the right quantity is used as much will con dense on the mesh etc etc.
Ohhh and the maverick device device is all of that and more.
I have one.
it's bloody dangerous, an accident waiting to happen. There is no licensing of it as a product ...in fact it would never get a licence as it uses a small creme brullee type gas torch inside an enclosed space to unregulatedly heat a copper chamber . The whole device gets ridiculously hot, so hot you can watch OA sublimating as you add it to the copper cap. It looks like something knocked up in someones garage, which it is.