Bike Maintenance Training Advice

Looking for suggestions from coaches, cyclists, or perhaps someone who's been through my unfortunate situation. Basically I am looking at maybe an entire year in which I probably won't be riding outdoors, at least for training purposes, but in which I do want to maintain cycling fitness as well as use the trainer to build back cardio and leg strength until I can run again. Really need ideas for a structured, very LONG TERM program to maintain bike fitness (probably starting from pretty low but not zero) and build power, but not a race-focused one.

The situation: In my first race of the season (Challenge Wanaka in NZ), I managed to trip on the run (on trails) late in the race and pretty nastily fracture my elbow (separation of the olecranon and humerus, with a nice gap and one minor bone fragment). The pieces have been screwed back together and I've been given the following rough timeline for returning to swim/bike/run:

Swim 4-6 weeks. Realistically it will probably be much longer until it looks like proper swimming, but at least in terms of getting into a pool and working on range of motion, doing what I can like kicking, one-arm stuff, etc. I have come back from a previous arm injury so have some idea of the process that will entail. Basically am not going to be swimming for cardio fitness anytime soon.

Bike on trainer or stationary: 3-4 weeks (2-3 weeks from now). No restrictions as far as I know, but aero will probably not be comfortable due to position of the fracture and the hardware. I have a road bike, tri bike, trainer, and PM.

Run: 6-10 weeks depending on healing, mainly due to impact and risk of re-injury if I managed to trip again.

I will probably be cleared for outdoor biking in 10-12 weeks but really don't see the point for training purposes. Our local roads are very rough, and I think between that and the hardware, it's going to be uncomfortable. I won't be cleared to race until late June at earliest and at that point would not have the run or swim fitness to do so. Our late summer/fall plans are also up in the air due to a job/move situation. So I can't really plan late-season events; plus I really don't know how much swimming I'll be able to do at that point, the impact of the hardware and remaining arm strength/mobility issues on stuff like getting off the wetsuit, on and off the bike, etc. I think it's just not worth the risk and discomfort to do a tri until the hardware comes out (probably late this year or early next)) and next tri season rolls around, assuming I'm up to it by then.

But I would like to keep in shape for biking. Possibly I could really use this time to make some major power gains later this year. The bike has always been my weakness--basically in my last race it's the only thing that stood between me and an AG win and KQ. Not sure that's realistic anytime soon anymore, or what the long-term impact of this injury on my normally strong swim will be, but if I do continue in tri I would certainly be much more competitive with a stronger bike leg.

Aside from biking will probably mainly use other training time to get back to swimming as my arm allows and possibly train for a marathon or HM or two (more "complete' than "compete") once I'm cleared to run.

Sorry for long post--am looking for ideas of a long-range program that involves maybe 3-4 key rides per week, 5-7 are fine initially until I start building back run volume.