There's already a few things in the series that covers that - one of the benefits of fold drive is that if you have or can do the math for the coordinates, you can go anywhere instantly and bring more ships with you, and there's a couple bits of tech out there that can be used but, to date, haven't been mostly due to 'eh, we got good enough now'. And then there's one that shows up in one of the NF trailers which apparently got overlooked by some people despite being a classic...Besides, we have some Time Lords, block transfer mathematics remains a viable option anyway.
So, short answer is, we look at what we have and what might be possible, and work with it. The main issue with the Covenant Slipstream drive is that the Covenant tech is so idiosyncratic it's barely worth the time to mess with it when there's already four kinds of FTL drives that don't require being watched like a goddamn souffle.
And hell, if it gets bad enough, who knows what Zef's got in that lab of his in the asteroid belts by Gamma Canaris...
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Geoff Depew - Darth Mephron
Haberdasher to Androids, Dark Lord of Sith Tech Support.