Reasons why that escape end strat is bad:
a) You'll probably fail to get Jon into a good position and get the hoverbike into a good position quickly enough.
b) You can't press B fast at the 1st comp or you'll get off, so you have to go to it, wait until the normal time you'd press B (or the music won't have started before one of your presses kicks in) press it once, wait, press it twice.
b) You have to do a gay manouvre getting to the 2nd computer
c) Don't even think about hammaring B as you approach the 2nd comp or you'll get off. You'd have to time it well and if you fail you'll have to wait and then press again.
The only area you can save time is from the T-intersection going to 2 comps (heading towards the 2nd computer). All the effort for this is not worth it.