Simple change aimed at balancing bionics further - require the installation and removal of them to be done in an area with a surgical unit or similar (hospital, science lab), put the character out of commission for a while (i.e. recovery sleep), and cause large amounts of pain unless done under anaesthetic. Could also cause a more specific disease as soon as the character wakes up related to getting used to the new bionics in their body, which wears down over time. No idea what the effects of this would be, probably simple stat loss.
I don’t like the idea, as half the point of this was to require characters to go to dangerous locations and make them safe in order to install bionics, but you could also allow kitchen sink surgery to be done with greater penalties using makeshift surgical beds/tools/whatever if you wished.