How does Manual Payments work in Pro Sites?

Since the charging of Sales Tax is unavailable in Pro Sites I have decided that for the initial and growing number of site owners in our new multisite we will offer the following manual payment option:

1) Recurring invoice (for reference) via our accounting software, and 2) Recurring direct debit set up via Gocardless

To set up Gocardless would require 6 specific links to their payment portal e.g. Monthly and Yearly x 3 levels. Can we embed text-links/image-links in the manual payment instructions?

N.B. This represents a workaround solution to charging the correct sales tax by both setting up direct debits for prices inclusive of VAT with reference invoices sent out for each client by our accounting software i.e. Two separate systems working together.