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Globs at 800 ISO can be as short as 5-10 seconds and you can bump the ISO as the noise factor is minimal for the exposure time. I normally take about 20-30 and stack them as per usual. More is better, discard the duds.
If you can get alignment good 10-20 secs will do better on the fainter globs and stars in them.
Don't worry aout the LP filter for now, you can process that out with noiseware and some curves. Start shooting.
Experiment and see ... a bit of judicious procesing can pull a lot out of minimal frames.
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