Thanks for sharing some of your history there - I'm pretty sure that erging can only help Lorraine manage the ABPA( I assume she is on medication for the condition too).
Like with me, it is a case of maximising the effective use of the erg within the confines of a slightly restrictive medical condition(sorry, I am starting to sound like a management training video

).
Some background as to how I came around to this method of training :
In 2008 I committed to doing a 24 hr row with Plummy and Spikeola(Michael Gough).
In my late teens and early twenties I used to do ultra-distance running and always found myself being overtaken in the second half of the races by much older and slower athletes - this indicated to me that what I was lacking was strength, not speed(probably due to my youth I had not had the time to build up a solid strength and endurance base).
With this in mind I decided to get "strong" for the 24 hr row - I did all my rowing on max DF and did 15 consecutive 100km+ weeks.
When the day of the row came, i set the rower on DF 125, set off and had an incident-free row, no injuries, very few aches and pains.
Carried on rowing on max DF but gradually let thing slip until in 2011 I was diagnosed with Atrial Fibrillation after having a DVT in my arm - at that point my weight had ballooned to 115kg(from 93-94kg at the time of the 24 hr).
I was put on medication including Beta Blockers which sort of took anaerobic training out of the equation but I once again adopted the mantra that "you can never be too strong", and removed the mesh grille from the erg to allow me to train at the higher DF - over the next 9 months- 1 year I did about 3 million metres rowing on DF 250 - 360, knocked off 25kg, improved my EF(% of blood pumped out to the body from the left ventricle) by over 50%, and set PB's at every distance I attempted(all except 100m,500m and 2k).
From that time onwards I was totally sold on my training methods(even if no-one else was

).
If you are still awake, back to the present - I would have really liked to try my hand at a bit of heavy lifting having never done it before, and also the Ski-erg which I believe I would be far better at than the erg, but having an ICD implant pretty much precludes me from overhead lifting as I have been advised not to do movements that pull the clavicle down.
So I have got back into the routine that worked for me before - I had a really good month in January doing 400km - my highest monthly total for quite a while, and have lost over 20kg since mid September, so felt strong enough to remove the grille again and start rowing at DF 250 - started yesterday doing an 8k @ 19.2 spm and took a bit of getting used to again.
Today was much better 10k @ 19.4SPM.
These rows are done at a rather pedestrian pace(a snail's pace for you - 2:15 ish), but my HR is staying extremely low ( 100-110) and I liken the sessions to a high-rep, low weight workout.
Forgive the rather rambling post - I would be very interested to hear about your erg goals(short and long-term) and more about your field event and powerlifting exploits.
Cheers
Paul