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Thanx for your service!
Sounds like she's ready for a new/rebuilt starter when you get back. Odd quink-dink - I just looked for another Teener stranded this weekend, & PP has the rebuilt Bosch units for $120 + core, if you're inclined to do it now.
Another trick to get 914's, VWs & Porsches of that era to start when the starter has a "flat spot" or gets heat jammed, is to crawl under it & tap (not bash/bang) the starter with a ball peen hammer or something, while someone else turns the key to start. That or the hill trick - BTW use 3rd gear not 2nd - or wait to cool down usually works. However, it will continue to dog you at the least opportune Murphy's Law times once this starts happening, until changed. These VW/Porsche Bosch starters usually go for about 7+/- years or 50-100k miles - depending upon use & other factors.
Stay safe over there!