When you say grind like mad, do you mean:
(i) Ask where most Imperial Charity missions are
(ii) Dump credits into all available on bulletin board there
(iii) Instance switch to refresh and return to (ii) until your next promotion?
That, to me, does sound like madness, yes.
That the Dev sais that they can allow internals on certain ships to be the only fits to fit certain modules does open up some interesting possibilities.
High Capacity cargo racks, or armoured cargo racks for the Lakon Type series are interesting ideas.
I saw here https://forums.frontier.co.uk/showthread.php/283520-Lakon-Fragment-Cannon that the dev stream had a Lakon branded module, so the possibly of proprietary cargo rack that only fits their haulers, it the specialised internals could become a thing.
The Cargo racks seem to hold 4 canisters per SRV sized space, or an alternative configuration by Lakon could allow for more canisters per space without a Tardis effect
I do like the Type 7 none the less, the had the niche of low running costs and repairs relative to cost of ship once.