Oh come on 
they do. For the run to fully translate you have to go train some biking, but isn’t that exactly what the OP is after?
Just do this 
You seem to know what you are doing. Get as strong as you can on the bike while doing enough to maintain swim and run and when finances are available upgrade the equipment. No need to overthink it.
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Well at least in this case they don’t, so while chasing > 4w/kg is what will ultimately get him to his goal, there’s some seriously low hanging fruit to attack right now without getting that concerned with raising ftp. If you have a true 4w/kg hour power and can hold 95% of that and then run well off the bike with what should be a 20 min or better swim you should be somewhere around 2:10, giving 5 minutes for transitions which is 34 minutes faster and very competitive for the overall. Very few amateurs are very good at all three legs, mostly you can be very fast if you are fast at 2 of the three and don’t blow it on the third.
Sure faster runners are faster runners. But pool swimming? Not really (unless it’s a pool swim! ). Training a 40min 10k fresh gets you probably a 43-ish Oly tri split. That’s certainly not bad, but there’s room to grow there. Swimming 1:20s in a 25y pool (an assumption on my part, admittedly)… there’s LOTS of room to grow there without doing tons and tons of work. Find a 50m pool for one thing… that alone will make a tangible difference.
My overall point is that someone wanting to compete at a high amateur level who is training a 40min 10k and 1:20/100y (both fresh), vs a 4.0W/kg FTP on the bike, isn’t as strong a runner and swimmer as they think they are. 4.0W/kg is plenty strong enough on the bike to be competitive at the AG level.