Kashflow / IRIS is very much geared to UK law. So payroll/tax etc will not work here. It will do all the other stuff fine. Alternatives like Xero or Quickbooks are also not Switzerland specific. Abacus is Swiss and you may just use the payroll module.
for very simple have a look at zoho books. Xero has more functionality and will work with mt940 from your bank for automatic reconciliation. none does swiss payroll but that would be ok for you being alone.
alternative for abacus is winbiz for switzerland.
better to outsource completely in my view if it is distracting you from your business
Banana Accounting is cheap but you need to be into excel and have experience. It is not for the entrepreneur that just wants to do easy bookkeeping. (unless you love excel)
I'm looking at changing from Xero to Bexio, because the latter synchronises with my bank, allows you to generate invoices with orange slips and sorts out the Swis sVAT return at the click of a button. Anyone any experience?