what?
core launcher needs astro 1, expanded launcher needs astro 2...
it's like, an hour? at most?

also, lol at not having spare probes

That does not sound like an attractive situation, altho I expect most w-space dwellers have done some or all of the GǣoopsGǥ things that have lead to your current predicament GǪ just not altogether in such a sequence. The extent of your poor planning and preparation does standout though.

If you only have one toon in the system youGÇÖre prolly reliant on the goodwill of some visiting scanner, because you canGÇÖt loadup the hauler and reliably retain the scanner ship for ten days if your POS only has fuel for 7-days. Just stay online in system in your scanner ship for as long as you can, and request help from time to time. You will probably find that helpful souls outnumber hostile opportunists, but the difficulty is knowing in advance which is which. Worst outcome is you get ganked and all in-system is pretty well lost. Best case is that you get to hisec and get more probes and donGÇÖt lose anything.

If you have 2 toons, one able to fly the DST and one the scanner, then IGÇÖd suggest offlining the POS and loading what you can of the SMAs, CHAs, goodies, and fuel into the DST. Priority would go to SMA (to refit the scanner when your training time is up) and fuel (to restart the POS). An offline tower with offline defence mods but no SMA/CHA is not going to be a very attractive gank target. Once you have waited enough time (sounds like at least 3 GÇô 4 days) for POS-fuel time to be at least as long a skill-training time, then you can online the POS again. Worst outcome is that the tower gets joy-killed and you have nothing to resurrect when your training time is done. Best case is that it all turns out well and you only lose the stuff in excess of your DSTGÇÖs cargohold volume.

If you have giant secure containers you can anchor them at a safe-spot and salt away some of your stuff while you wait.

Assuming this does not put you off w-space, please do make sure you have some backup scanner alts in your system at all times. Early on mine were minimal skills and in T1 frigates, bare minimum to be able to find a wormhole if I got ganked out to my hisec med-clone. Now theyGÇÖre all 5-4-4-4 skilled and flying covops frigs GǪ but I still have at least one as backup at all times, and thankfully have never needed them.

Good luck.