Note - I don't do my testing half arsed. It's full on or nothing at all.
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For the record, the spawn point for meetups is roughly where I thought it would be, near the Jungle Pens. My fear was it was going to place me somewhere near the banner at the bottom of the hill, thus messing up my planned distance, but thankfully it's where we expected - in fact it's actually a tiny bit further back from the pens than I'd anticipated. Took me about 0.35 miles to get from where I'd started to the actual pen exit and 0.5 to where the Strava Jungle Lead-In segment begins. You leave the tarmac section at 1.1 miles.
I originally set my meetup for 8.8 miles as a test and that worked out to be just after the lap banner after one full lap, but I'll probably set our distance to 9 miles to give us a margin for error and cause I like round numbers. Also the dirt climb doesn't begin again until about 9.15, so the extra bit is all flat and mainly on wooden bridges anyway.
That does mean though that if you create your own meetup (rather than have me create one for you), you will need to make sure your Companion app is set to Imperial rather than Metric temporarily, as the Distance field only accepts numbers to one decimal point and 9 miles is 14.484km - or you can set it to 14.5km and hope that the extra 16 metres doesn't make any difference to your time!